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Finding the Fourth Proportional to 125,891.78, 173,760.21 and 72,175.82

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Solution

The fourth proportional to 125,891.78, 173,760.21 and 72,175.82 is: 99,619.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,891.78 : 173,760.21 = 72,175.82 : x
  2. Step 2: Convert to fraction form
    125,891.78/173,760.21 = 72,175.82/x
  3. Step 3: Cross multiply
    125,891.78x = 173,760.21 × 72,175.82
  4. Step 4: Simplify right side
    125,891.78x = 12,541,285,640.12
  5. Step 5: Solve for x
    x = 12,541,285,640.12/125,891.78
  6. Step 6: Final answer
    x = 99,619.58

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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.