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Finding the Fourth Proportional to 138,665.52, 207,590.04 and 85,905.36

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Solution

The fourth proportional to 138,665.52, 207,590.04 and 85,905.36 is: 128,605.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,665.52 : 207,590.04 = 85,905.36 : x
  2. Step 2: Convert to fraction form
    138,665.52/207,590.04 = 85,905.36/x
  3. Step 3: Cross multiply
    138,665.52x = 207,590.04 × 85,905.36
  4. Step 4: Simplify right side
    138,665.52x = 17,833,097,118.61
  5. Step 5: Solve for x
    x = 17,833,097,118.61/138,665.52
  6. Step 6: Final answer
    x = 128,605.13

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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.