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Finding the Fourth Proportional to 159.65, 239.52 and 128.57

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Solution

The fourth proportional to 159.65, 239.52 and 128.57 is: 192.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.65 : 239.52 = 128.57 : x
  2. Step 2: Convert to fraction form
    159.65/239.52 = 128.57/x
  3. Step 3: Cross multiply
    159.65x = 239.52 × 128.57
  4. Step 4: Simplify right side
    159.65x = 30,793.89
  5. Step 5: Solve for x
    x = 30,793.89/159.65
  6. Step 6: Final answer
    x = 192.89

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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.