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Finding the Fourth Proportional to 71,781.60, 99,059.76 and 39,951.84

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Solution

The fourth proportional to 71,781.60, 99,059.76 and 39,951.84 is: 55,134.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,781.60 : 99,059.76 = 39,951.84 : x
  2. Step 2: Convert to fraction form
    71,781.60/99,059.76 = 39,951.84/x
  3. Step 3: Cross multiply
    71,781.60x = 99,059.76 × 39,951.84
  4. Step 4: Simplify right side
    71,781.60x = 3,957,619,681.96
  5. Step 5: Solve for x
    x = 3,957,619,681.96/71,781.60
  6. Step 6: Final answer
    x = 55,134.18

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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.