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Finding the Fourth Proportional to 8,789.88, 12,129.84 and 5,251.80

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Solution

The fourth proportional to 8,789.88, 12,129.84 and 5,251.80 is: 7,247.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,789.88 : 12,129.84 = 5,251.80 : x
  2. Step 2: Convert to fraction form
    8,789.88/12,129.84 = 5,251.80/x
  3. Step 3: Cross multiply
    8,789.88x = 12,129.84 × 5,251.80
  4. Step 4: Simplify right side
    8,789.88x = 63,703,493.71
  5. Step 5: Solve for x
    x = 63,703,493.71/8,789.88
  6. Step 6: Final answer
    x = 7,247.37

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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.