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Finding the Fourth Proportional to 317, 475.20 and 143.72

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Solution

The fourth proportional to 317, 475.20 and 143.72 is: 215.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    317 : 475.20 = 143.72 : x
  2. Step 2: Convert to fraction form
    317/475.20 = 143.72/x
  3. Step 3: Cross multiply
    317x = 475.20 × 143.72
  4. Step 4: Simplify right side
    317x = 68,295.74
  5. Step 5: Solve for x
    x = 68,295.74/317
  6. Step 6: Final answer
    x = 215.44

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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.