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Finding the Fourth Proportional to 1,168.20, 1,611.43 and 725.78

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Solution

The fourth proportional to 1,168.20, 1,611.43 and 725.78 is: 1,001.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,168.20 : 1,611.43 = 725.78 : x
  2. Step 2: Convert to fraction form
    1,168.20/1,611.43 = 725.78/x
  3. Step 3: Cross multiply
    1,168.20x = 1,611.43 × 725.78
  4. Step 4: Simplify right side
    1,168.20x = 1,169,545.88
  5. Step 5: Solve for x
    x = 1,169,545.88/1,168.20
  6. Step 6: Final answer
    x = 1,001.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.