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Finding the Fourth Proportional to 812.43, 1,217.03 and 749.52

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Solution

The fourth proportional to 812.43, 1,217.03 and 749.52 is: 1,122.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.43 : 1,217.03 = 749.52 : x
  2. Step 2: Convert to fraction form
    812.43/1,217.03 = 749.52/x
  3. Step 3: Cross multiply
    812.43x = 1,217.03 × 749.52
  4. Step 4: Simplify right side
    812.43x = 912,184.58
  5. Step 5: Solve for x
    x = 912,184.58/812.43
  6. Step 6: Final answer
    x = 1,122.79

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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.