Home / 20,968.20-31,451.40-7,117.20

Finding the Fourth Proportional to 20,968.20, 31,451.40 and 7,117.20

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Solution

The fourth proportional to 20,968.20, 31,451.40 and 7,117.20 is: 10,675.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,968.20 : 31,451.40 = 7,117.20 : x
  2. Step 2: Convert to fraction form
    20,968.20/31,451.40 = 7,117.20/x
  3. Step 3: Cross multiply
    20,968.20x = 31,451.40 × 7,117.20
  4. Step 4: Simplify right side
    20,968.20x = 223,845,904.08
  5. Step 5: Solve for x
    x = 223,845,904.08/20,968.20
  6. Step 6: Final answer
    x = 10,675.49

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Half scale
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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.