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Finding the Fourth Proportional to 769.57, 1,062.11 and 489.71

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Solution

The fourth proportional to 769.57, 1,062.11 and 489.71 is: 675.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.57 : 1,062.11 = 489.71 : x
  2. Step 2: Convert to fraction form
    769.57/1,062.11 = 489.71/x
  3. Step 3: Cross multiply
    769.57x = 1,062.11 × 489.71
  4. Step 4: Simplify right side
    769.57x = 520,129.77
  5. Step 5: Solve for x
    x = 520,129.77/769.57
  6. Step 6: Final answer
    x = 675.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.