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Finding the Fourth Proportional to 318.42, 477.10 and 112.87

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Solution

The fourth proportional to 318.42, 477.10 and 112.87 is: 169.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.42 : 477.10 = 112.87 : x
  2. Step 2: Convert to fraction form
    318.42/477.10 = 112.87/x
  3. Step 3: Cross multiply
    318.42x = 477.10 × 112.87
  4. Step 4: Simplify right side
    318.42x = 53,850.28
  5. Step 5: Solve for x
    x = 53,850.28/318.42
  6. Step 6: Final answer
    x = 169.12

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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.