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Finding the Fourth Proportional to 2,480.38, 3,720.76 and 749

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Solution

The fourth proportional to 2,480.38, 3,720.76 and 749 is: 1,123.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,480.38 : 3,720.76 = 749 : x
  2. Step 2: Convert to fraction form
    2,480.38/3,720.76 = 749/x
  3. Step 3: Cross multiply
    2,480.38x = 3,720.76 × 749
  4. Step 4: Simplify right side
    2,480.38x = 2,786,849.24
  5. Step 5: Solve for x
    x = 2,786,849.24/2,480.38
  6. Step 6: Final answer
    x = 1,123.56

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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.