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Finding the Fourth Proportional to 28,065, 38,729.75 and 15,489.75

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Solution

The fourth proportional to 28,065, 38,729.75 and 15,489.75 is: 21,375.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,065 : 38,729.75 = 15,489.75 : x
  2. Step 2: Convert to fraction form
    28,065/38,729.75 = 15,489.75/x
  3. Step 3: Cross multiply
    28,065x = 38,729.75 × 15,489.75
  4. Step 4: Simplify right side
    28,065x = 599,914,067.61
  5. Step 5: Solve for x
    x = 599,914,067.61/28,065
  6. Step 6: Final answer
    x = 21,375.88

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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.