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Finding the Fourth Proportional to 372.92, 513.95 and 331.40

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Solution

The fourth proportional to 372.92, 513.95 and 331.40 is: 456.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.92 : 513.95 = 331.40 : x
  2. Step 2: Convert to fraction form
    372.92/513.95 = 331.40/x
  3. Step 3: Cross multiply
    372.92x = 513.95 × 331.40
  4. Step 4: Simplify right side
    372.92x = 170,322.66
  5. Step 5: Solve for x
    x = 170,322.66/372.92
  6. Step 6: Final answer
    x = 456.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.