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Finding the Fourth Proportional to 315.42, 473.17 and 132.79

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Solution

The fourth proportional to 315.42, 473.17 and 132.79 is: 199.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.42 : 473.17 = 132.79 : x
  2. Step 2: Convert to fraction form
    315.42/473.17 = 132.79/x
  3. Step 3: Cross multiply
    315.42x = 473.17 × 132.79
  4. Step 4: Simplify right side
    315.42x = 62,832.24
  5. Step 5: Solve for x
    x = 62,832.24/315.42
  6. Step 6: Final answer
    x = 199.20

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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.