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Finding the Fourth Proportional to 25,921.98, 38,889.14 and 8,391.80

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Solution

The fourth proportional to 25,921.98, 38,889.14 and 8,391.80 is: 12,589.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,921.98 : 38,889.14 = 8,391.80 : x
  2. Step 2: Convert to fraction form
    25,921.98/38,889.14 = 8,391.80/x
  3. Step 3: Cross multiply
    25,921.98x = 38,889.14 × 8,391.80
  4. Step 4: Simplify right side
    25,921.98x = 326,350,060.44
  5. Step 5: Solve for x
    x = 326,350,060.44/25,921.98
  6. Step 6: Final answer
    x = 12,589.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.