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Finding the Fourth Proportional to 318.52, 476.38 and 274.78

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Solution

The fourth proportional to 318.52, 476.38 and 274.78 is: 410.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.52 : 476.38 = 274.78 : x
  2. Step 2: Convert to fraction form
    318.52/476.38 = 274.78/x
  3. Step 3: Cross multiply
    318.52x = 476.38 × 274.78
  4. Step 4: Simplify right side
    318.52x = 130,899.70
  5. Step 5: Solve for x
    x = 130,899.70/318.52
  6. Step 6: Final answer
    x = 410.96

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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.