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Finding the Fourth Proportional to 28,138.97, 38,832.03 and 15,391.90

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Solution

The fourth proportional to 28,138.97, 38,832.03 and 15,391.90 is: 21,240.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,138.97 : 38,832.03 = 15,391.90 : x
  2. Step 2: Convert to fraction form
    28,138.97/38,832.03 = 15,391.90/x
  3. Step 3: Cross multiply
    28,138.97x = 38,832.03 × 15,391.90
  4. Step 4: Simplify right side
    28,138.97x = 597,698,722.56
  5. Step 5: Solve for x
    x = 597,698,722.56/28,138.97
  6. Step 6: Final answer
    x = 21,240.96

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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.