Home / 21,728.97-29,986.52-12,168.78

Finding the Fourth Proportional to 21,728.97, 29,986.52 and 12,168.78

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Solution

The fourth proportional to 21,728.97, 29,986.52 and 12,168.78 is: 16,793.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,728.97 : 29,986.52 = 12,168.78 : x
  2. Step 2: Convert to fraction form
    21,728.97/29,986.52 = 12,168.78/x
  3. Step 3: Cross multiply
    21,728.97x = 29,986.52 × 12,168.78
  4. Step 4: Simplify right side
    21,728.97x = 364,899,304.00
  5. Step 5: Solve for x
    x = 364,899,304.00/21,728.97
  6. Step 6: Final answer
    x = 16,793.22

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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.