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Finding the Fourth Proportional to 159.91, 239.76 and 102.15

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Solution

The fourth proportional to 159.91, 239.76 and 102.15 is: 153.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.91 : 239.76 = 102.15 : x
  2. Step 2: Convert to fraction form
    159.91/239.76 = 102.15/x
  3. Step 3: Cross multiply
    159.91x = 239.76 × 102.15
  4. Step 4: Simplify right side
    159.91x = 24,491.48
  5. Step 5: Solve for x
    x = 24,491.48/159.91
  6. Step 6: Final answer
    x = 153.16

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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.