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Finding the Fourth Proportional to 68,709.96, 103,079.64 and 21,324.02

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Solution

The fourth proportional to 68,709.96, 103,079.64 and 21,324.02 is: 31,990.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,709.96 : 103,079.64 = 21,324.02 : x
  2. Step 2: Convert to fraction form
    68,709.96/103,079.64 = 21,324.02/x
  3. Step 3: Cross multiply
    68,709.96x = 103,079.64 × 21,324.02
  4. Step 4: Simplify right side
    68,709.96x = 2,198,071,789.55
  5. Step 5: Solve for x
    x = 2,198,071,789.55/68,709.96
  6. Step 6: Final answer
    x = 31,990.58

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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.