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Finding the Fourth Proportional to 28,288, 39,039.06 and 15,713.56

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Solution

The fourth proportional to 28,288, 39,039.06 and 15,713.56 is: 21,685.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,288 : 39,039.06 = 15,713.56 : x
  2. Step 2: Convert to fraction form
    28,288/39,039.06 = 15,713.56/x
  3. Step 3: Cross multiply
    28,288x = 39,039.06 × 15,713.56
  4. Step 4: Simplify right side
    28,288x = 613,442,611.65
  5. Step 5: Solve for x
    x = 613,442,611.65/28,288
  6. Step 6: Final answer
    x = 21,685.61

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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.