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Finding the Fourth Proportional to 318.17, 477.42 and 317.20

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Solution

The fourth proportional to 318.17, 477.42 and 317.20 is: 475.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.17 : 477.42 = 317.20 : x
  2. Step 2: Convert to fraction form
    318.17/477.42 = 317.20/x
  3. Step 3: Cross multiply
    318.17x = 477.42 × 317.20
  4. Step 4: Simplify right side
    318.17x = 151,437.62
  5. Step 5: Solve for x
    x = 151,437.62/318.17
  6. Step 6: Final answer
    x = 475.96

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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.