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Finding the Fourth Proportional to 68,715.52, 103,087.99 and 21,329.57

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Solution

The fourth proportional to 68,715.52, 103,087.99 and 21,329.57 is: 31,998.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,715.52 : 103,087.99 = 21,329.57 : x
  2. Step 2: Convert to fraction form
    68,715.52/103,087.99 = 21,329.57/x
  3. Step 3: Cross multiply
    68,715.52x = 103,087.99 × 21,329.57
  4. Step 4: Simplify right side
    68,715.52x = 2,198,822,498.86
  5. Step 5: Solve for x
    x = 2,198,822,498.86/68,715.52
  6. Step 6: Final answer
    x = 31,998.92

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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.