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Finding the Fourth Proportional to 8,379.68, 12,561.02 and 5,261.88

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Solution

The fourth proportional to 8,379.68, 12,561.02 and 5,261.88 is: 7,887.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,379.68 : 12,561.02 = 5,261.88 : x
  2. Step 2: Convert to fraction form
    8,379.68/12,561.02 = 5,261.88/x
  3. Step 3: Cross multiply
    8,379.68x = 12,561.02 × 5,261.88
  4. Step 4: Simplify right side
    8,379.68x = 66,094,579.92
  5. Step 5: Solve for x
    x = 66,094,579.92/8,379.68
  6. Step 6: Final answer
    x = 7,887.48

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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.