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Finding the Fourth Proportional to 138,505.60, 207,758.40 and 45,020.80

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Solution

The fourth proportional to 138,505.60, 207,758.40 and 45,020.80 is: 67,531.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,505.60 : 207,758.40 = 45,020.80 : x
  2. Step 2: Convert to fraction form
    138,505.60/207,758.40 = 45,020.80/x
  3. Step 3: Cross multiply
    138,505.60x = 207,758.40 × 45,020.80
  4. Step 4: Simplify right side
    138,505.60x = 9,353,449,374.72
  5. Step 5: Solve for x
    x = 9,353,449,374.72/138,505.60
  6. Step 6: Final answer
    x = 67,531.20

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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.