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Finding the Fourth Proportional to 432.70, 649.12 and 155.12

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Solution

The fourth proportional to 432.70, 649.12 and 155.12 is: 232.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.70 : 649.12 = 155.12 : x
  2. Step 2: Convert to fraction form
    432.70/649.12 = 155.12/x
  3. Step 3: Cross multiply
    432.70x = 649.12 × 155.12
  4. Step 4: Simplify right side
    432.70x = 100,691.49
  5. Step 5: Solve for x
    x = 100,691.49/432.70
  6. Step 6: Final answer
    x = 232.71

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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.