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Finding the Fourth Proportional to 432.05, 649.28 and 421.11

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Solution

The fourth proportional to 432.05, 649.28 and 421.11 is: 632.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.05 : 649.28 = 421.11 : x
  2. Step 2: Convert to fraction form
    432.05/649.28 = 421.11/x
  3. Step 3: Cross multiply
    432.05x = 649.28 × 421.11
  4. Step 4: Simplify right side
    432.05x = 273,419.35
  5. Step 5: Solve for x
    x = 273,419.35/432.05
  6. Step 6: Final answer
    x = 632.85

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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.