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Finding the Fourth Proportional to 239.78, 330.92 and 134.87

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Solution

The fourth proportional to 239.78, 330.92 and 134.87 is: 186.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.78 : 330.92 = 134.87 : x
  2. Step 2: Convert to fraction form
    239.78/330.92 = 134.87/x
  3. Step 3: Cross multiply
    239.78x = 330.92 × 134.87
  4. Step 4: Simplify right side
    239.78x = 44,631.52
  5. Step 5: Solve for x
    x = 44,631.52/239.78
  6. Step 6: Final answer
    x = 186.14

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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.