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Finding the Fourth Proportional to 138,419.20, 207,490.56 and 68,348.80

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Solution

The fourth proportional to 138,419.20, 207,490.56 and 68,348.80 is: 102,454.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,419.20 : 207,490.56 = 68,348.80 : x
  2. Step 2: Convert to fraction form
    138,419.20/207,490.56 = 68,348.80/x
  3. Step 3: Cross multiply
    138,419.20x = 207,490.56 × 68,348.80
  4. Step 4: Simplify right side
    138,419.20x = 14,181,730,787.33
  5. Step 5: Solve for x
    x = 14,181,730,787.33/138,419.20
  6. Step 6: Final answer
    x = 102,454.94

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1.5x scale

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.