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Finding the Fourth Proportional to 68,704.50, 103,071.45 and 21,318.57

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Solution

The fourth proportional to 68,704.50, 103,071.45 and 21,318.57 is: 31,982.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,704.50 : 103,071.45 = 21,318.57 : x
  2. Step 2: Convert to fraction form
    68,704.50/103,071.45 = 21,318.57/x
  3. Step 3: Cross multiply
    68,704.50x = 103,071.45 × 21,318.57
  4. Step 4: Simplify right side
    68,704.50x = 2,197,335,921.83
  5. Step 5: Solve for x
    x = 2,197,335,921.83/68,704.50
  6. Step 6: Final answer
    x = 31,982.42

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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.