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Finding the Fourth Proportional to 115,217.69, 158,864.41 and 78,936.53

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Solution

The fourth proportional to 115,217.69, 158,864.41 and 78,936.53 is: 108,839.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,217.69 : 158,864.41 = 78,936.53 : x
  2. Step 2: Convert to fraction form
    115,217.69/158,864.41 = 78,936.53/x
  3. Step 3: Cross multiply
    115,217.69x = 158,864.41 × 78,936.53
  4. Step 4: Simplify right side
    115,217.69x = 12,540,205,761.73
  5. Step 5: Solve for x
    x = 12,540,205,761.73/115,217.69
  6. Step 6: Final answer
    x = 108,839.24

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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.