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Finding the Fourth Proportional to 153,990.76, 231,062.76 and 86,480.92

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Solution

The fourth proportional to 153,990.76, 231,062.76 and 86,480.92 is: 129,764.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,990.76 : 231,062.76 = 86,480.92 : x
  2. Step 2: Convert to fraction form
    153,990.76/231,062.76 = 86,480.92/x
  3. Step 3: Cross multiply
    153,990.76x = 231,062.76 × 86,480.92
  4. Step 4: Simplify right side
    153,990.76x = 19,982,520,062.54
  5. Step 5: Solve for x
    x = 19,982,520,062.54/153,990.76
  6. Step 6: Final answer
    x = 129,764.41

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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.