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Finding the Fourth Proportional to 7,231.76, 9,979.60 and 4,087.92

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Solution

The fourth proportional to 7,231.76, 9,979.60 and 4,087.92 is: 5,641.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,231.76 : 9,979.60 = 4,087.92 : x
  2. Step 2: Convert to fraction form
    7,231.76/9,979.60 = 4,087.92/x
  3. Step 3: Cross multiply
    7,231.76x = 9,979.60 × 4,087.92
  4. Step 4: Simplify right side
    7,231.76x = 40,795,806.43
  5. Step 5: Solve for x
    x = 40,795,806.43/7,231.76
  6. Step 6: Final answer
    x = 5,641.20

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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.