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Finding the Fourth Proportional to 68,695.20, 103,057.51 and 21,309.27

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Solution

The fourth proportional to 68,695.20, 103,057.51 and 21,309.27 is: 31,968.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,695.20 : 103,057.51 = 21,309.27 : x
  2. Step 2: Convert to fraction form
    68,695.20/103,057.51 = 21,309.27/x
  3. Step 3: Cross multiply
    68,695.20x = 103,057.51 × 21,309.27
  4. Step 4: Simplify right side
    68,695.20x = 2,196,079,906.33
  5. Step 5: Solve for x
    x = 2,196,079,906.33/68,695.20
  6. Step 6: Final answer
    x = 31,968.46

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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.