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Finding the Fourth Proportional to 318.28, 476.88 and 253.48

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Solution

The fourth proportional to 318.28, 476.88 and 253.48 is: 379.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.28 : 476.88 = 253.48 : x
  2. Step 2: Convert to fraction form
    318.28/476.88 = 253.48/x
  3. Step 3: Cross multiply
    318.28x = 476.88 × 253.48
  4. Step 4: Simplify right side
    318.28x = 120,879.54
  5. Step 5: Solve for x
    x = 120,879.54/318.28
  6. Step 6: Final answer
    x = 379.79

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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.