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Finding the Fourth Proportional to 159.90, 240.12 and 86.73

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Solution

The fourth proportional to 159.90, 240.12 and 86.73 is: 130.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.90 : 240.12 = 86.73 : x
  2. Step 2: Convert to fraction form
    159.90/240.12 = 86.73/x
  3. Step 3: Cross multiply
    159.90x = 240.12 × 86.73
  4. Step 4: Simplify right side
    159.90x = 20,825.61
  5. Step 5: Solve for x
    x = 20,825.61/159.90
  6. Step 6: Final answer
    x = 130.24

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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.