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Finding the Fourth Proportional to 66,487.68, 91,761.12 and 38,193.30

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Solution

The fourth proportional to 66,487.68, 91,761.12 and 38,193.30 is: 52,711.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,487.68 : 91,761.12 = 38,193.30 : x
  2. Step 2: Convert to fraction form
    66,487.68/91,761.12 = 38,193.30/x
  3. Step 3: Cross multiply
    66,487.68x = 91,761.12 × 38,193.30
  4. Step 4: Simplify right side
    66,487.68x = 3,504,659,984.50
  5. Step 5: Solve for x
    x = 3,504,659,984.50/66,487.68
  6. Step 6: Final answer
    x = 52,711.42

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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.