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Finding the Fourth Proportional to 159.40, 239.12 and 61.91

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Solution

The fourth proportional to 159.40, 239.12 and 61.91 is: 92.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.40 : 239.12 = 61.91 : x
  2. Step 2: Convert to fraction form
    159.40/239.12 = 61.91/x
  3. Step 3: Cross multiply
    159.40x = 239.12 × 61.91
  4. Step 4: Simplify right side
    159.40x = 14,803.92
  5. Step 5: Solve for x
    x = 14,803.92/159.40
  6. Step 6: Final answer
    x = 92.87

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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.