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Finding the Fourth Proportional to 138,379.20, 207,223.20 and 91,377.60

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Solution

The fourth proportional to 138,379.20, 207,223.20 and 91,377.60 is: 136,838.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,379.20 : 207,223.20 = 91,377.60 : x
  2. Step 2: Convert to fraction form
    138,379.20/207,223.20 = 91,377.60/x
  3. Step 3: Cross multiply
    138,379.20x = 207,223.20 × 91,377.60
  4. Step 4: Simplify right side
    138,379.20x = 18,935,558,680.32
  5. Step 5: Solve for x
    x = 18,935,558,680.32/138,379.20
  6. Step 6: Final answer
    x = 136,838.19

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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.