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Finding the Fourth Proportional to 100,618.98, 138,843.02 and 80,468.52

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Solution

The fourth proportional to 100,618.98, 138,843.02 and 80,468.52 is: 111,037.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,618.98 : 138,843.02 = 80,468.52 : x
  2. Step 2: Convert to fraction form
    100,618.98/138,843.02 = 80,468.52/x
  3. Step 3: Cross multiply
    100,618.98x = 138,843.02 × 80,468.52
  4. Step 4: Simplify right side
    100,618.98x = 11,172,492,331.73
  5. Step 5: Solve for x
    x = 11,172,492,331.73/100,618.98
  6. Step 6: Final answer
    x = 111,037.62

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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.