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Finding the Fourth Proportional to 138,668.02, 207,593.79 and 85,907.86

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Solution

The fourth proportional to 138,668.02, 207,593.79 and 85,907.86 is: 128,608.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,668.02 : 207,593.79 = 85,907.86 : x
  2. Step 2: Convert to fraction form
    138,668.02/207,593.79 = 85,907.86/x
  3. Step 3: Cross multiply
    138,668.02x = 207,593.79 × 85,907.86
  4. Step 4: Simplify right side
    138,668.02x = 17,833,938,248.19
  5. Step 5: Solve for x
    x = 17,833,938,248.19/138,668.02
  6. Step 6: Final answer
    x = 128,608.88

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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.