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Finding the Fourth Proportional to 18,759.75, 28,139.90 and 4,908.75

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Solution

The fourth proportional to 18,759.75, 28,139.90 and 4,908.75 is: 7,363.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,759.75 : 28,139.90 = 4,908.75 : x
  2. Step 2: Convert to fraction form
    18,759.75/28,139.90 = 4,908.75/x
  3. Step 3: Cross multiply
    18,759.75x = 28,139.90 × 4,908.75
  4. Step 4: Simplify right side
    18,759.75x = 138,131,734.13
  5. Step 5: Solve for x
    x = 138,131,734.13/18,759.75
  6. Step 6: Final answer
    x = 7,363.20

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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.