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Finding the Fourth Proportional to 432.76, 649 and 144.20

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Solution

The fourth proportional to 432.76, 649 and 144.20 is: 216.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.76 : 649 = 144.20 : x
  2. Step 2: Convert to fraction form
    432.76/649 = 144.20/x
  3. Step 3: Cross multiply
    432.76x = 649 × 144.20
  4. Step 4: Simplify right side
    432.76x = 93,585.80
  5. Step 5: Solve for x
    x = 93,585.80/432.76
  6. Step 6: Final answer
    x = 216.25

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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.