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Finding the Fourth Proportional to 315.43, 472.98 and 132.78

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Solution

The fourth proportional to 315.43, 472.98 and 132.78 is: 199.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.43 : 472.98 = 132.78 : x
  2. Step 2: Convert to fraction form
    315.43/472.98 = 132.78/x
  3. Step 3: Cross multiply
    315.43x = 472.98 × 132.78
  4. Step 4: Simplify right side
    315.43x = 62,802.28
  5. Step 5: Solve for x
    x = 62,802.28/315.43
  6. Step 6: Final answer
    x = 199.10

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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.