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Finding the Fourth Proportional to 138,436.55, 207,490.80 and 124,330.40

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Solution

The fourth proportional to 138,436.55, 207,490.80 and 124,330.40 is: 186,348.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,436.55 : 207,490.80 = 124,330.40 : x
  2. Step 2: Convert to fraction form
    138,436.55/207,490.80 = 124,330.40/x
  3. Step 3: Cross multiply
    138,436.55x = 207,490.80 × 124,330.40
  4. Step 4: Simplify right side
    138,436.55x = 25,797,414,160.32
  5. Step 5: Solve for x
    x = 25,797,414,160.32/138,436.55
  6. Step 6: Final answer
    x = 186,348.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.