Home / 20,770.28-28,662.82-11,338.76

Finding the Fourth Proportional to 20,770.28, 28,662.82 and 11,338.76

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Solution

The fourth proportional to 20,770.28, 28,662.82 and 11,338.76 is: 15,647.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,770.28 : 28,662.82 = 11,338.76 : x
  2. Step 2: Convert to fraction form
    20,770.28/28,662.82 = 11,338.76/x
  3. Step 3: Cross multiply
    20,770.28x = 28,662.82 × 11,338.76
  4. Step 4: Simplify right side
    20,770.28x = 325,000,836.90
  5. Step 5: Solve for x
    x = 325,000,836.90/20,770.28
  6. Step 6: Final answer
    x = 15,647.40

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Find fourth proportional to 10,385.14, 14,331.41 and 5,669.38
Half scale
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Double scale
Find fourth proportional to 20,771.28, 28,664.20 and 11,339.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.