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Finding the Fourth Proportional to 432.80, 649.84 and 411.92

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Solution

The fourth proportional to 432.80, 649.84 and 411.92 is: 618.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.80 : 649.84 = 411.92 : x
  2. Step 2: Convert to fraction form
    432.80/649.84 = 411.92/x
  3. Step 3: Cross multiply
    432.80x = 649.84 × 411.92
  4. Step 4: Simplify right side
    432.80x = 267,682.09
  5. Step 5: Solve for x
    x = 267,682.09/432.80
  6. Step 6: Final answer
    x = 618.49

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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.