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Finding the Fourth Proportional to 239.68, 330.74 and 134.75

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Solution

The fourth proportional to 239.68, 330.74 and 134.75 is: 185.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.68 : 330.74 = 134.75 : x
  2. Step 2: Convert to fraction form
    239.68/330.74 = 134.75/x
  3. Step 3: Cross multiply
    239.68x = 330.74 × 134.75
  4. Step 4: Simplify right side
    239.68x = 44,568.38
  5. Step 5: Solve for x
    x = 44,568.38/239.68
  6. Step 6: Final answer
    x = 185.95

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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.