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Finding the Fourth Proportional to 8,780.80, 13,171.20 and 7,687.30

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Solution

The fourth proportional to 8,780.80, 13,171.20 and 7,687.30 is: 11,530.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,780.80 : 13,171.20 = 7,687.30 : x
  2. Step 2: Convert to fraction form
    8,780.80/13,171.20 = 7,687.30/x
  3. Step 3: Cross multiply
    8,780.80x = 13,171.20 × 7,687.30
  4. Step 4: Simplify right side
    8,780.80x = 101,250,965.76
  5. Step 5: Solve for x
    x = 101,250,965.76/8,780.80
  6. Step 6: Final answer
    x = 11,530.95

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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.