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Finding the Fourth Proportional to 8,679.76, 11,969.11 and 7,424.97

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Solution

The fourth proportional to 8,679.76, 11,969.11 and 7,424.97 is: 10,238.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.76 : 11,969.11 = 7,424.97 : x
  2. Step 2: Convert to fraction form
    8,679.76/11,969.11 = 7,424.97/x
  3. Step 3: Cross multiply
    8,679.76x = 11,969.11 × 7,424.97
  4. Step 4: Simplify right side
    8,679.76x = 88,870,252.75
  5. Step 5: Solve for x
    x = 88,870,252.75/8,679.76
  6. Step 6: Final answer
    x = 10,238.79

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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.