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Finding the Fourth Proportional to 71,515.60, 98,691.69 and 39,684.58

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Solution

The fourth proportional to 71,515.60, 98,691.69 and 39,684.58 is: 54,764.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,515.60 : 98,691.69 = 39,684.58 : x
  2. Step 2: Convert to fraction form
    71,515.60/98,691.69 = 39,684.58/x
  3. Step 3: Cross multiply
    71,515.60x = 98,691.69 × 39,684.58
  4. Step 4: Simplify right side
    71,515.60x = 3,916,538,267.14
  5. Step 5: Solve for x
    x = 3,916,538,267.14/71,515.60
  6. Step 6: Final answer
    x = 54,764.81

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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.