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Finding the Fourth Proportional to 836.65, 1,251.33 and 489.16

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Solution

The fourth proportional to 836.65, 1,251.33 and 489.16 is: 731.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.65 : 1,251.33 = 489.16 : x
  2. Step 2: Convert to fraction form
    836.65/1,251.33 = 489.16/x
  3. Step 3: Cross multiply
    836.65x = 1,251.33 × 489.16
  4. Step 4: Simplify right side
    836.65x = 612,100.58
  5. Step 5: Solve for x
    x = 612,100.58/836.65
  6. Step 6: Final answer
    x = 731.61

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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.