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Finding the Fourth Proportional to 15,760.80, 21,751.20 and 8,687.88

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Solution

The fourth proportional to 15,760.80, 21,751.20 and 8,687.88 is: 11,989.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,760.80 : 21,751.20 = 8,687.88 : x
  2. Step 2: Convert to fraction form
    15,760.80/21,751.20 = 8,687.88/x
  3. Step 3: Cross multiply
    15,760.80x = 21,751.20 × 8,687.88
  4. Step 4: Simplify right side
    15,760.80x = 188,971,815.46
  5. Step 5: Solve for x
    x = 188,971,815.46/15,760.80
  6. Step 6: Final answer
    x = 11,989.99

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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.