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Finding the Fourth Proportional to 239.69, 330.75 and 134.78

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Solution

The fourth proportional to 239.69, 330.75 and 134.78 is: 185.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.69 : 330.75 = 134.78 : x
  2. Step 2: Convert to fraction form
    239.69/330.75 = 134.78/x
  3. Step 3: Cross multiply
    239.69x = 330.75 × 134.78
  4. Step 4: Simplify right side
    239.69x = 44,578.49
  5. Step 5: Solve for x
    x = 44,578.49/239.69
  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.