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Finding the Fourth Proportional to 874.26, 1,311.28 and 326.36

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Solution

The fourth proportional to 874.26, 1,311.28 and 326.36 is: 489.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.26 : 1,311.28 = 326.36 : x
  2. Step 2: Convert to fraction form
    874.26/1,311.28 = 326.36/x
  3. Step 3: Cross multiply
    874.26x = 1,311.28 × 326.36
  4. Step 4: Simplify right side
    874.26x = 427,951.80
  5. Step 5: Solve for x
    x = 427,951.80/874.26
  6. Step 6: Final answer
    x = 489.50

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Double scale
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1.5x scale

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.