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Finding the Fourth Proportional to 874.66, 1,311.39 and 326.74

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Solution

The fourth proportional to 874.66, 1,311.39 and 326.74 is: 489.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.66 : 1,311.39 = 326.74 : x
  2. Step 2: Convert to fraction form
    874.66/1,311.39 = 326.74/x
  3. Step 3: Cross multiply
    874.66x = 1,311.39 × 326.74
  4. Step 4: Simplify right side
    874.66x = 428,483.57
  5. Step 5: Solve for x
    x = 428,483.57/874.66
  6. Step 6: Final answer
    x = 489.89

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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.