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Finding the Fourth Proportional to 316.97, 475.20 and 239.78

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Solution

The fourth proportional to 316.97, 475.20 and 239.78 is: 359.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.97 : 475.20 = 239.78 : x
  2. Step 2: Convert to fraction form
    316.97/475.20 = 239.78/x
  3. Step 3: Cross multiply
    316.97x = 475.20 × 239.78
  4. Step 4: Simplify right side
    316.97x = 113,943.46
  5. Step 5: Solve for x
    x = 113,943.46/316.97
  6. Step 6: Final answer
    x = 359.48

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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.