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Finding the Fourth Proportional to 308.72, 426.12 and 177.78

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Solution

The fourth proportional to 308.72, 426.12 and 177.78 is: 245.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.72 : 426.12 = 177.78 : x
  2. Step 2: Convert to fraction form
    308.72/426.12 = 177.78/x
  3. Step 3: Cross multiply
    308.72x = 426.12 × 177.78
  4. Step 4: Simplify right side
    308.72x = 75,755.61
  5. Step 5: Solve for x
    x = 75,755.61/308.72
  6. Step 6: Final answer
    x = 245.39

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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.