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Finding the Fourth Proportional to 12,486.80, 18,728.04 and 4,695.68

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Solution

The fourth proportional to 12,486.80, 18,728.04 and 4,695.68 is: 7,042.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.80 : 18,728.04 = 4,695.68 : x
  2. Step 2: Convert to fraction form
    12,486.80/18,728.04 = 4,695.68/x
  3. Step 3: Cross multiply
    12,486.80x = 18,728.04 × 4,695.68
  4. Step 4: Simplify right side
    12,486.80x = 87,940,882.87
  5. Step 5: Solve for x
    x = 87,940,882.87/12,486.80
  6. Step 6: Final answer
    x = 7,042.71

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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.