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Finding the Fourth Proportional to 763.22, 1,143.92 and 489.85

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Solution

The fourth proportional to 763.22, 1,143.92 and 489.85 is: 734.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.22 : 1,143.92 = 489.85 : x
  2. Step 2: Convert to fraction form
    763.22/1,143.92 = 489.85/x
  3. Step 3: Cross multiply
    763.22x = 1,143.92 × 489.85
  4. Step 4: Simplify right side
    763.22x = 560,347.58
  5. Step 5: Solve for x
    x = 560,347.58/763.22
  6. Step 6: Final answer
    x = 734.19

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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.