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Finding the Fourth Proportional to 2,480.78, 3,720.90 and 749.36

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Solution

The fourth proportional to 2,480.78, 3,720.90 and 749.36 is: 1,123.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,480.78 : 3,720.90 = 749.36 : x
  2. Step 2: Convert to fraction form
    2,480.78/3,720.90 = 749.36/x
  3. Step 3: Cross multiply
    2,480.78x = 3,720.90 × 749.36
  4. Step 4: Simplify right side
    2,480.78x = 2,788,293.62
  5. Step 5: Solve for x
    x = 2,788,293.62/2,480.78
  6. Step 6: Final answer
    x = 1,123.96

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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.