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Finding the Fourth Proportional to 2,112.62, 3,168.96 and 725.90

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Solution

The fourth proportional to 2,112.62, 3,168.96 and 725.90 is: 1,088.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.62 : 3,168.96 = 725.90 : x
  2. Step 2: Convert to fraction form
    2,112.62/3,168.96 = 725.90/x
  3. Step 3: Cross multiply
    2,112.62x = 3,168.96 × 725.90
  4. Step 4: Simplify right side
    2,112.62x = 2,300,348.06
  5. Step 5: Solve for x
    x = 2,300,348.06/2,112.62
  6. Step 6: Final answer
    x = 1,088.86

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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.