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Finding the Fourth Proportional to 159.87, 239.73 and 86.73

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Solution

The fourth proportional to 159.87, 239.73 and 86.73 is: 130.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.87 : 239.73 = 86.73 : x
  2. Step 2: Convert to fraction form
    159.87/239.73 = 86.73/x
  3. Step 3: Cross multiply
    159.87x = 239.73 × 86.73
  4. Step 4: Simplify right side
    159.87x = 20,791.78
  5. Step 5: Solve for x
    x = 20,791.78/159.87
  6. Step 6: Final answer
    x = 130.05

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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.