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Finding the Fourth Proportional to 8,561.28, 12,824.47 and 6,985.61

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Solution

The fourth proportional to 8,561.28, 12,824.47 and 6,985.61 is: 10,464.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,561.28 : 12,824.47 = 6,985.61 : x
  2. Step 2: Convert to fraction form
    8,561.28/12,824.47 = 6,985.61/x
  3. Step 3: Cross multiply
    8,561.28x = 12,824.47 × 6,985.61
  4. Step 4: Simplify right side
    8,561.28x = 89,586,745.88
  5. Step 5: Solve for x
    x = 89,586,745.88/8,561.28
  6. Step 6: Final answer
    x = 10,464.18

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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.