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Finding the Fourth Proportional to 15,769.40, 21,760.78 and 8,695.88

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Solution

The fourth proportional to 15,769.40, 21,760.78 and 8,695.88 is: 11,999.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,769.40 : 21,760.78 = 8,695.88 : x
  2. Step 2: Convert to fraction form
    15,769.40/21,760.78 = 8,695.88/x
  3. Step 3: Cross multiply
    15,769.40x = 21,760.78 × 8,695.88
  4. Step 4: Simplify right side
    15,769.40x = 189,229,131.59
  5. Step 5: Solve for x
    x = 189,229,131.59/15,769.40
  6. Step 6: Final answer
    x = 11,999.77

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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.