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Finding the Fourth Proportional to 432.79, 649.28 and 144.23

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Solution

The fourth proportional to 432.79, 649.28 and 144.23 is: 216.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.79 : 649.28 = 144.23 : x
  2. Step 2: Convert to fraction form
    432.79/649.28 = 144.23/x
  3. Step 3: Cross multiply
    432.79x = 649.28 × 144.23
  4. Step 4: Simplify right side
    432.79x = 93,645.65
  5. Step 5: Solve for x
    x = 93,645.65/432.79
  6. Step 6: Final answer
    x = 216.38

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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.