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Finding the Fourth Proportional to 68,699.28, 103,063.68 and 21,313.38

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Solution

The fourth proportional to 68,699.28, 103,063.68 and 21,313.38 is: 31,974.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,699.28 : 103,063.68 = 21,313.38 : x
  2. Step 2: Convert to fraction form
    68,699.28/103,063.68 = 21,313.38/x
  3. Step 3: Cross multiply
    68,699.28x = 103,063.68 × 21,313.38
  4. Step 4: Simplify right side
    68,699.28x = 2,196,635,376.04
  5. Step 5: Solve for x
    x = 2,196,635,376.04/68,699.28
  6. Step 6: Final answer
    x = 31,974.65

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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.