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Finding the Fourth Proportional to 2,601.20, 3,901.90 and 752.50

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Solution

The fourth proportional to 2,601.20, 3,901.90 and 752.50 is: 1,128.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,601.20 : 3,901.90 = 752.50 : x
  2. Step 2: Convert to fraction form
    2,601.20/3,901.90 = 752.50/x
  3. Step 3: Cross multiply
    2,601.20x = 3,901.90 × 752.50
  4. Step 4: Simplify right side
    2,601.20x = 2,936,179.75
  5. Step 5: Solve for x
    x = 2,936,179.75/2,601.20
  6. Step 6: Final answer
    x = 1,128.78

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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.