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Finding the Fourth Proportional to 7,252.80, 10,879.20 and 5,138.70

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Solution

The fourth proportional to 7,252.80, 10,879.20 and 5,138.70 is: 7,708.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,252.80 : 10,879.20 = 5,138.70 : x
  2. Step 2: Convert to fraction form
    7,252.80/10,879.20 = 5,138.70/x
  3. Step 3: Cross multiply
    7,252.80x = 10,879.20 × 5,138.70
  4. Step 4: Simplify right side
    7,252.80x = 55,904,945.04
  5. Step 5: Solve for x
    x = 55,904,945.04/7,252.80
  6. Step 6: Final answer
    x = 7,708.05

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1.5x scale

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.