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Finding the Fourth Proportional to 318.52, 478.14 and 126.28

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Solution

The fourth proportional to 318.52, 478.14 and 126.28 is: 189.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.52 : 478.14 = 126.28 : x
  2. Step 2: Convert to fraction form
    318.52/478.14 = 126.28/x
  3. Step 3: Cross multiply
    318.52x = 478.14 × 126.28
  4. Step 4: Simplify right side
    318.52x = 60,379.52
  5. Step 5: Solve for x
    x = 60,379.52/318.52
  6. Step 6: Final answer
    x = 189.56

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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.