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Finding the Fourth Proportional to 68,739.24, 103,086.90 and 21,981

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Solution

The fourth proportional to 68,739.24, 103,086.90 and 21,981 is: 32,964.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,739.24 : 103,086.90 = 21,981 : x
  2. Step 2: Convert to fraction form
    68,739.24/103,086.90 = 21,981/x
  3. Step 3: Cross multiply
    68,739.24x = 103,086.90 × 21,981
  4. Step 4: Simplify right side
    68,739.24x = 2,265,953,148.90
  5. Step 5: Solve for x
    x = 2,265,953,148.90/68,739.24
  6. Step 6: Final answer
    x = 32,964.48

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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.