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Finding the Fourth Proportional to 315.97, 472.70 and 239.15

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Solution

The fourth proportional to 315.97, 472.70 and 239.15 is: 357.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.97 : 472.70 = 239.15 : x
  2. Step 2: Convert to fraction form
    315.97/472.70 = 239.15/x
  3. Step 3: Cross multiply
    315.97x = 472.70 × 239.15
  4. Step 4: Simplify right side
    315.97x = 113,047.98
  5. Step 5: Solve for x
    x = 113,047.98/315.97
  6. Step 6: Final answer
    x = 357.78

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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.