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Finding the Fourth Proportional to 18,876.80, 28,317.92 and 6,397.92

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Solution

The fourth proportional to 18,876.80, 28,317.92 and 6,397.92 is: 9,597.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,876.80 : 28,317.92 = 6,397.92 : x
  2. Step 2: Convert to fraction form
    18,876.80/28,317.92 = 6,397.92/x
  3. Step 3: Cross multiply
    18,876.80x = 28,317.92 × 6,397.92
  4. Step 4: Simplify right side
    18,876.80x = 181,175,786.73
  5. Step 5: Solve for x
    x = 181,175,786.73/18,876.80
  6. Step 6: Final answer
    x = 9,597.80

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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.