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Finding the Fourth Proportional to 1,074.22, 1,611.15 and 489.04

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Solution

The fourth proportional to 1,074.22, 1,611.15 and 489.04 is: 733.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.22 : 1,611.15 = 489.04 : x
  2. Step 2: Convert to fraction form
    1,074.22/1,611.15 = 489.04/x
  3. Step 3: Cross multiply
    1,074.22x = 1,611.15 × 489.04
  4. Step 4: Simplify right side
    1,074.22x = 787,916.80
  5. Step 5: Solve for x
    x = 787,916.80/1,074.22
  6. Step 6: Final answer
    x = 733.48

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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.