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Finding the Fourth Proportional to 40,691.90, 60,988.65 and 20,959.70

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Solution

The fourth proportional to 40,691.90, 60,988.65 and 20,959.70 is: 31,414.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,691.90 : 60,988.65 = 20,959.70 : x
  2. Step 2: Convert to fraction form
    40,691.90/60,988.65 = 20,959.70/x
  3. Step 3: Cross multiply
    40,691.90x = 60,988.65 × 20,959.70
  4. Step 4: Simplify right side
    40,691.90x = 1,278,303,397.66
  5. Step 5: Solve for x
    x = 1,278,303,397.66/40,691.90
  6. Step 6: Final answer
    x = 31,414.20

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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.