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Finding the Fourth Proportional to 15,912.88, 21,959.80 and 8,839.38

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Solution

The fourth proportional to 15,912.88, 21,959.80 and 8,839.38 is: 12,198.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,912.88 : 21,959.80 = 8,839.38 : x
  2. Step 2: Convert to fraction form
    15,912.88/21,959.80 = 8,839.38/x
  3. Step 3: Cross multiply
    15,912.88x = 21,959.80 × 8,839.38
  4. Step 4: Simplify right side
    15,912.88x = 194,111,016.92
  5. Step 5: Solve for x
    x = 194,111,016.92/15,912.88
  6. Step 6: Final answer
    x = 12,198.36

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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.