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Finding the Fourth Proportional to 5,380.97, 7,424.97 and 2,990.78

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Solution

The fourth proportional to 5,380.97, 7,424.97 and 2,990.78 is: 4,126.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,380.97 : 7,424.97 = 2,990.78 : x
  2. Step 2: Convert to fraction form
    5,380.97/7,424.97 = 2,990.78/x
  3. Step 3: Cross multiply
    5,380.97x = 7,424.97 × 2,990.78
  4. Step 4: Simplify right side
    5,380.97x = 22,206,451.78
  5. Step 5: Solve for x
    x = 22,206,451.78/5,380.97
  6. Step 6: Final answer
    x = 4,126.85

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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.