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Finding the Fourth Proportional to 68,067.40, 102,110.70 and 21,315.40

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Solution

The fourth proportional to 68,067.40, 102,110.70 and 21,315.40 is: 31,976.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,067.40 : 102,110.70 = 21,315.40 : x
  2. Step 2: Convert to fraction form
    68,067.40/102,110.70 = 21,315.40/x
  3. Step 3: Cross multiply
    68,067.40x = 102,110.70 × 21,315.40
  4. Step 4: Simplify right side
    68,067.40x = 2,176,530,414.78
  5. Step 5: Solve for x
    x = 2,176,530,414.78/68,067.40
  6. Step 6: Final answer
    x = 31,976.11

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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.