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Finding the Fourth Proportional to 66,459.78, 91,691.55 and 42,599.61

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Solution

The fourth proportional to 66,459.78, 91,691.55 and 42,599.61 is: 58,772.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,459.78 : 91,691.55 = 42,599.61 : x
  2. Step 2: Convert to fraction form
    66,459.78/91,691.55 = 42,599.61/x
  3. Step 3: Cross multiply
    66,459.78x = 91,691.55 × 42,599.61
  4. Step 4: Simplify right side
    66,459.78x = 3,906,024,270.30
  5. Step 5: Solve for x
    x = 3,906,024,270.30/66,459.78
  6. Step 6: Final answer
    x = 58,772.75

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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.