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Finding the Fourth Proportional to 185.97, 278.46 and 128.15

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Solution

The fourth proportional to 185.97, 278.46 and 128.15 is: 191.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.97 : 278.46 = 128.15 : x
  2. Step 2: Convert to fraction form
    185.97/278.46 = 128.15/x
  3. Step 3: Cross multiply
    185.97x = 278.46 × 128.15
  4. Step 4: Simplify right side
    185.97x = 35,683.26
  5. Step 5: Solve for x
    x = 35,683.26/185.97
  6. Step 6: Final answer
    x = 191.88

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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.