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Finding the Fourth Proportional to 159.86, 239.45 and 78.59

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Solution

The fourth proportional to 159.86, 239.45 and 78.59 is: 117.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.86 : 239.45 = 78.59 : x
  2. Step 2: Convert to fraction form
    159.86/239.45 = 78.59/x
  3. Step 3: Cross multiply
    159.86x = 239.45 × 78.59
  4. Step 4: Simplify right side
    159.86x = 18,816.79
  5. Step 5: Solve for x
    x = 18,816.79/159.86
  6. Step 6: Final answer
    x = 117.71

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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.