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Finding the Fourth Proportional to 138,381.20, 207,226.20 and 91,379.60

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Solution

The fourth proportional to 138,381.20, 207,226.20 and 91,379.60 is: 136,841.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,381.20 : 207,226.20 = 91,379.60 : x
  2. Step 2: Convert to fraction form
    138,381.20/207,226.20 = 91,379.60/x
  3. Step 3: Cross multiply
    138,381.20x = 207,226.20 × 91,379.60
  4. Step 4: Simplify right side
    138,381.20x = 18,936,247,265.52
  5. Step 5: Solve for x
    x = 18,936,247,265.52/138,381.20
  6. Step 6: Final answer
    x = 136,841.18

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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.