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Finding the Fourth Proportional to 8,119.80, 12,177.06 and 3,187.80

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Solution

The fourth proportional to 8,119.80, 12,177.06 and 3,187.80 is: 4,780.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,119.80 : 12,177.06 = 3,187.80 : x
  2. Step 2: Convert to fraction form
    8,119.80/12,177.06 = 3,187.80/x
  3. Step 3: Cross multiply
    8,119.80x = 12,177.06 × 3,187.80
  4. Step 4: Simplify right side
    8,119.80x = 38,818,031.87
  5. Step 5: Solve for x
    x = 38,818,031.87/8,119.80
  6. Step 6: Final answer
    x = 4,780.66

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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.