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Finding the Fourth Proportional to 123,489.53, 170,414.61 and 66,900.50

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Solution

The fourth proportional to 123,489.53, 170,414.61 and 66,900.50 is: 92,322.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,489.53 : 170,414.61 = 66,900.50 : x
  2. Step 2: Convert to fraction form
    123,489.53/170,414.61 = 66,900.50/x
  3. Step 3: Cross multiply
    123,489.53x = 170,414.61 × 66,900.50
  4. Step 4: Simplify right side
    123,489.53x = 11,400,822,616.31
  5. Step 5: Solve for x
    x = 11,400,822,616.31/123,489.53
  6. Step 6: Final answer
    x = 92,322.18

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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.