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Finding the Fourth Proportional to 874.56, 1,311.84 and 489.36

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Solution

The fourth proportional to 874.56, 1,311.84 and 489.36 is: 734.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.56 : 1,311.84 = 489.36 : x
  2. Step 2: Convert to fraction form
    874.56/1,311.84 = 489.36/x
  3. Step 3: Cross multiply
    874.56x = 1,311.84 × 489.36
  4. Step 4: Simplify right side
    874.56x = 641,962.02
  5. Step 5: Solve for x
    x = 641,962.02/874.56
  6. Step 6: Final answer
    x = 734.04

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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.