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Finding the Fourth Proportional to 39,691.68, 54,775.13 and 21,788.31

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Solution

The fourth proportional to 39,691.68, 54,775.13 and 21,788.31 is: 30,068.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,691.68 : 54,775.13 = 21,788.31 : x
  2. Step 2: Convert to fraction form
    39,691.68/54,775.13 = 21,788.31/x
  3. Step 3: Cross multiply
    39,691.68x = 54,775.13 × 21,788.31
  4. Step 4: Simplify right side
    39,691.68x = 1,193,457,512.73
  5. Step 5: Solve for x
    x = 1,193,457,512.73/39,691.68
  6. Step 6: Final answer
    x = 30,068.20

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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.