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Finding the Fourth Proportional to 432.80, 649.20 and 331.36

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Solution

The fourth proportional to 432.80, 649.20 and 331.36 is: 497.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.80 : 649.20 = 331.36 : x
  2. Step 2: Convert to fraction form
    432.80/649.20 = 331.36/x
  3. Step 3: Cross multiply
    432.80x = 649.20 × 331.36
  4. Step 4: Simplify right side
    432.80x = 215,118.91
  5. Step 5: Solve for x
    x = 215,118.91/432.80
  6. Step 6: Final answer
    x = 497.04

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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.