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Finding the Fourth Proportional to 2,751.87, 4,128.39 and 803.91

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Solution

The fourth proportional to 2,751.87, 4,128.39 and 803.91 is: 1,206.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,751.87 : 4,128.39 = 803.91 : x
  2. Step 2: Convert to fraction form
    2,751.87/4,128.39 = 803.91/x
  3. Step 3: Cross multiply
    2,751.87x = 4,128.39 × 803.91
  4. Step 4: Simplify right side
    2,751.87x = 3,318,854.00
  5. Step 5: Solve for x
    x = 3,318,854.00/2,751.87
  6. Step 6: Final answer
    x = 1,206.04

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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.