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Finding the Fourth Proportional to 2,757.38, 4,129.22 and 1,931.78

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Solution

The fourth proportional to 2,757.38, 4,129.22 and 1,931.78 is: 2,892.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,757.38 : 4,129.22 = 1,931.78 : x
  2. Step 2: Convert to fraction form
    2,757.38/4,129.22 = 1,931.78/x
  3. Step 3: Cross multiply
    2,757.38x = 4,129.22 × 1,931.78
  4. Step 4: Simplify right side
    2,757.38x = 7,976,744.61
  5. Step 5: Solve for x
    x = 7,976,744.61/2,757.38
  6. Step 6: Final answer
    x = 2,892.87

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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.