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Finding the Fourth Proportional to 15,912.68, 21,959.94 and 8,839.55

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Solution

The fourth proportional to 15,912.68, 21,959.94 and 8,839.55 is: 12,198.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,912.68 : 21,959.94 = 8,839.55 : x
  2. Step 2: Convert to fraction form
    15,912.68/21,959.94 = 8,839.55/x
  3. Step 3: Cross multiply
    15,912.68x = 21,959.94 × 8,839.55
  4. Step 4: Simplify right side
    15,912.68x = 194,115,877.83
  5. Step 5: Solve for x
    x = 194,115,877.83/15,912.68
  6. Step 6: Final answer
    x = 12,198.82

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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.