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Finding the Fourth Proportional to 66,517.76, 91,584.96 and 56,425.28

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Solution

The fourth proportional to 66,517.76, 91,584.96 and 56,425.28 is: 77,689.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,517.76 : 91,584.96 = 56,425.28 : x
  2. Step 2: Convert to fraction form
    66,517.76/91,584.96 = 56,425.28/x
  3. Step 3: Cross multiply
    66,517.76x = 91,584.96 × 56,425.28
  4. Step 4: Simplify right side
    66,517.76x = 5,167,707,011.79
  5. Step 5: Solve for x
    x = 5,167,707,011.79/66,517.76
  6. Step 6: Final answer
    x = 77,689.13

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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.