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Finding the Fourth Proportional to 239.72, 330.80 and 134.78

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Solution

The fourth proportional to 239.72, 330.80 and 134.78 is: 185.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.72 : 330.80 = 134.78 : x
  2. Step 2: Convert to fraction form
    239.72/330.80 = 134.78/x
  3. Step 3: Cross multiply
    239.72x = 330.80 × 134.78
  4. Step 4: Simplify right side
    239.72x = 44,582.90
  5. Step 5: Solve for x
    x = 44,582.90/239.72
  6. Step 6: Final answer
    x = 185.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.