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Finding the Fourth Proportional to 432.87, 649.21 and 124.75

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Solution

The fourth proportional to 432.87, 649.21 and 124.75 is: 187.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.87 : 649.21 = 124.75 : x
  2. Step 2: Convert to fraction form
    432.87/649.21 = 124.75/x
  3. Step 3: Cross multiply
    432.87x = 649.21 × 124.75
  4. Step 4: Simplify right side
    432.87x = 80,988.95
  5. Step 5: Solve for x
    x = 80,988.95/432.87
  6. Step 6: Final answer
    x = 187.10

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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.