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Finding the Fourth Proportional to 432.91, 649.37 and 124.80

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Solution

The fourth proportional to 432.91, 649.37 and 124.80 is: 187.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.91 : 649.37 = 124.80 : x
  2. Step 2: Convert to fraction form
    432.91/649.37 = 124.80/x
  3. Step 3: Cross multiply
    432.91x = 649.37 × 124.80
  4. Step 4: Simplify right side
    432.91x = 81,041.38
  5. Step 5: Solve for x
    x = 81,041.38/432.91
  6. Step 6: Final answer
    x = 187.20

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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.