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Finding the Fourth Proportional to 7,287.80, 10,939.80 and 4,517.60

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Solution

The fourth proportional to 7,287.80, 10,939.80 and 4,517.60 is: 6,781.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,287.80 : 10,939.80 = 4,517.60 : x
  2. Step 2: Convert to fraction form
    7,287.80/10,939.80 = 4,517.60/x
  3. Step 3: Cross multiply
    7,287.80x = 10,939.80 × 4,517.60
  4. Step 4: Simplify right side
    7,287.80x = 49,421,640.48
  5. Step 5: Solve for x
    x = 49,421,640.48/7,287.80
  6. Step 6: Final answer
    x = 6,781.42

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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.