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Finding the Fourth Proportional to 6,641.28, 9,966 and 3,869.20

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Solution

The fourth proportional to 6,641.28, 9,966 and 3,869.20 is: 5,806.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,641.28 : 9,966 = 3,869.20 : x
  2. Step 2: Convert to fraction form
    6,641.28/9,966 = 3,869.20/x
  3. Step 3: Cross multiply
    6,641.28x = 9,966 × 3,869.20
  4. Step 4: Simplify right side
    6,641.28x = 38,560,447.20
  5. Step 5: Solve for x
    x = 38,560,447.20/6,641.28
  6. Step 6: Final answer
    x = 5,806.18

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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.