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Finding the Fourth Proportional to 663.10, 992.62 and 431.49

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Solution

The fourth proportional to 663.10, 992.62 and 431.49 is: 645.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.10 : 992.62 = 431.49 : x
  2. Step 2: Convert to fraction form
    663.10/992.62 = 431.49/x
  3. Step 3: Cross multiply
    663.10x = 992.62 × 431.49
  4. Step 4: Simplify right side
    663.10x = 428,309.87
  5. Step 5: Solve for x
    x = 428,309.87/663.10
  6. Step 6: Final answer
    x = 645.92

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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.