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Finding the Fourth Proportional to 138,588.60, 207,980.10 and 88,789.80

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Solution

The fourth proportional to 138,588.60, 207,980.10 and 88,789.80 is: 133,246.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,588.60 : 207,980.10 = 88,789.80 : x
  2. Step 2: Convert to fraction form
    138,588.60/207,980.10 = 88,789.80/x
  3. Step 3: Cross multiply
    138,588.60x = 207,980.10 × 88,789.80
  4. Step 4: Simplify right side
    138,588.60x = 18,466,511,482.98
  5. Step 5: Solve for x
    x = 18,466,511,482.98/138,588.60
  6. Step 6: Final answer
    x = 133,246.97

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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.