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Finding the Fourth Proportional to 123,489.79, 170,414.85 and 66,901.03

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Solution

The fourth proportional to 123,489.79, 170,414.85 and 66,901.03 is: 92,322.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,489.79 : 170,414.85 = 66,901.03 : x
  2. Step 2: Convert to fraction form
    123,489.79/170,414.85 = 66,901.03/x
  3. Step 3: Cross multiply
    123,489.79x = 170,414.85 × 66,901.03
  4. Step 4: Simplify right side
    123,489.79x = 11,400,929,211.24
  5. Step 5: Solve for x
    x = 11,400,929,211.24/123,489.79
  6. Step 6: Final answer
    x = 92,322.85

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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.