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Finding the Fourth Proportional to 5,380.42, 7,425 and 2,990.41

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Solution

The fourth proportional to 5,380.42, 7,425 and 2,990.41 is: 4,126.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,380.42 : 7,425 = 2,990.41 : x
  2. Step 2: Convert to fraction form
    5,380.42/7,425 = 2,990.41/x
  3. Step 3: Cross multiply
    5,380.42x = 7,425 × 2,990.41
  4. Step 4: Simplify right side
    5,380.42x = 22,203,794.25
  5. Step 5: Solve for x
    x = 22,203,794.25/5,380.42
  6. Step 6: Final answer
    x = 4,126.78

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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.