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Finding the Fourth Proportional to 316.74, 475.28 and 143.38

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Solution

The fourth proportional to 316.74, 475.28 and 143.38 is: 215.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.74 : 475.28 = 143.38 : x
  2. Step 2: Convert to fraction form
    316.74/475.28 = 143.38/x
  3. Step 3: Cross multiply
    316.74x = 475.28 × 143.38
  4. Step 4: Simplify right side
    316.74x = 68,142.55
  5. Step 5: Solve for x
    x = 68,142.55/316.74
  6. Step 6: Final answer
    x = 215.14

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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.