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Finding the Fourth Proportional to 138,064.12, 206,964.92 and 88,003.68

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Solution

The fourth proportional to 138,064.12, 206,964.92 and 88,003.68 is: 131,921.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,064.12 : 206,964.92 = 88,003.68 : x
  2. Step 2: Convert to fraction form
    138,064.12/206,964.92 = 88,003.68/x
  3. Step 3: Cross multiply
    138,064.12x = 206,964.92 × 88,003.68
  4. Step 4: Simplify right side
    138,064.12x = 18,213,674,590.91
  5. Step 5: Solve for x
    x = 18,213,674,590.91/138,064.12
  6. Step 6: Final answer
    x = 131,921.85

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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.