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Finding the Fourth Proportional to 68,721.92, 103,104.35 and 20,692.43

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Solution

The fourth proportional to 68,721.92, 103,104.35 and 20,692.43 is: 31,045.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,721.92 : 103,104.35 = 20,692.43 : x
  2. Step 2: Convert to fraction form
    68,721.92/103,104.35 = 20,692.43/x
  3. Step 3: Cross multiply
    68,721.92x = 103,104.35 × 20,692.43
  4. Step 4: Simplify right side
    68,721.92x = 2,133,479,545.07
  5. Step 5: Solve for x
    x = 2,133,479,545.07/68,721.92
  6. Step 6: Final answer
    x = 31,045.11

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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.