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Finding the Fourth Proportional to 7,231.80, 9,979.74 and 4,247.40

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Solution

The fourth proportional to 7,231.80, 9,979.74 and 4,247.40 is: 5,861.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,231.80 : 9,979.74 = 4,247.40 : x
  2. Step 2: Convert to fraction form
    7,231.80/9,979.74 = 4,247.40/x
  3. Step 3: Cross multiply
    7,231.80x = 9,979.74 × 4,247.40
  4. Step 4: Simplify right side
    7,231.80x = 42,387,947.68
  5. Step 5: Solve for x
    x = 42,387,947.68/7,231.80
  6. Step 6: Final answer
    x = 5,861.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.