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Finding the Fourth Proportional to 638.80, 956.50 and 432.92

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Solution

The fourth proportional to 638.80, 956.50 and 432.92 is: 648.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.80 : 956.50 = 432.92 : x
  2. Step 2: Convert to fraction form
    638.80/956.50 = 432.92/x
  3. Step 3: Cross multiply
    638.80x = 956.50 × 432.92
  4. Step 4: Simplify right side
    638.80x = 414,087.98
  5. Step 5: Solve for x
    x = 414,087.98/638.80
  6. Step 6: Final answer
    x = 648.23

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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.