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Finding the Fourth Proportional to 432.74, 649.18 and 158.78

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Solution

The fourth proportional to 432.74, 649.18 and 158.78 is: 238.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.74 : 649.18 = 158.78 : x
  2. Step 2: Convert to fraction form
    432.74/649.18 = 158.78/x
  3. Step 3: Cross multiply
    432.74x = 649.18 × 158.78
  4. Step 4: Simplify right side
    432.74x = 103,076.80
  5. Step 5: Solve for x
    x = 103,076.80/432.74
  6. Step 6: Final answer
    x = 238.20

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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.