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Finding the Fourth Proportional to 432.55, 648.87 and 143.92

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Solution

The fourth proportional to 432.55, 648.87 and 143.92 is: 215.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.55 : 648.87 = 143.92 : x
  2. Step 2: Convert to fraction form
    432.55/648.87 = 143.92/x
  3. Step 3: Cross multiply
    432.55x = 648.87 × 143.92
  4. Step 4: Simplify right side
    432.55x = 93,385.37
  5. Step 5: Solve for x
    x = 93,385.37/432.55
  6. Step 6: Final answer
    x = 215.89

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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.