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Finding the Fourth Proportional to 68,758.43, 103,139.81 and 21,373.77

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Solution

The fourth proportional to 68,758.43, 103,139.81 and 21,373.77 is: 32,061.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,758.43 : 103,139.81 = 21,373.77 : x
  2. Step 2: Convert to fraction form
    68,758.43/103,139.81 = 21,373.77/x
  3. Step 3: Cross multiply
    68,758.43x = 103,139.81 × 21,373.77
  4. Step 4: Simplify right side
    68,758.43x = 2,204,486,469.91
  5. Step 5: Solve for x
    x = 2,204,486,469.91/68,758.43
  6. Step 6: Final answer
    x = 32,061.33

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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.