Home / 20,630.89-28,475.31-13,087.63

Finding the Fourth Proportional to 20,630.89, 28,475.31 and 13,087.63

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Solution

The fourth proportional to 20,630.89, 28,475.31 and 13,087.63 is: 18,063.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,630.89 : 28,475.31 = 13,087.63 : x
  2. Step 2: Convert to fraction form
    20,630.89/28,475.31 = 13,087.63/x
  3. Step 3: Cross multiply
    20,630.89x = 28,475.31 × 13,087.63
  4. Step 4: Simplify right side
    20,630.89x = 372,674,321.42
  5. Step 5: Solve for x
    x = 372,674,321.42/20,630.89
  6. Step 6: Final answer
    x = 18,063.90

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Double scale
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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.