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Finding the Fourth Proportional to 8,391.68, 12,589.76 and 4,008.96

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Solution

The fourth proportional to 8,391.68, 12,589.76 and 4,008.96 is: 6,014.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.68 : 12,589.76 = 4,008.96 : x
  2. Step 2: Convert to fraction form
    8,391.68/12,589.76 = 4,008.96/x
  3. Step 3: Cross multiply
    8,391.68x = 12,589.76 × 4,008.96
  4. Step 4: Simplify right side
    8,391.68x = 50,471,844.25
  5. Step 5: Solve for x
    x = 50,471,844.25/8,391.68
  6. Step 6: Final answer
    x = 6,014.51

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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.