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Finding the Fourth Proportional to 159.83, 239.74 and 78.61

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Solution

The fourth proportional to 159.83, 239.74 and 78.61 is: 117.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.83 : 239.74 = 78.61 : x
  2. Step 2: Convert to fraction form
    159.83/239.74 = 78.61/x
  3. Step 3: Cross multiply
    159.83x = 239.74 × 78.61
  4. Step 4: Simplify right side
    159.83x = 18,844.97
  5. Step 5: Solve for x
    x = 18,844.97/159.83
  6. Step 6: Final answer
    x = 117.91

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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.