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Finding the Fourth Proportional to 18,837, 28,257.39 and 4,986

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Solution

The fourth proportional to 18,837, 28,257.39 and 4,986 is: 7,479.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,837 : 28,257.39 = 4,986 : x
  2. Step 2: Convert to fraction form
    18,837/28,257.39 = 4,986/x
  3. Step 3: Cross multiply
    18,837x = 28,257.39 × 4,986
  4. Step 4: Simplify right side
    18,837x = 140,891,346.54
  5. Step 5: Solve for x
    x = 140,891,346.54/18,837
  6. Step 6: Final answer
    x = 7,479.50

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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.