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Finding the Fourth Proportional to 68,708.40, 103,066.68 and 21,327.96

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Solution

The fourth proportional to 68,708.40, 103,066.68 and 21,327.96 is: 31,993.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,708.40 : 103,066.68 = 21,327.96 : x
  2. Step 2: Convert to fraction form
    68,708.40/103,066.68 = 21,327.96/x
  3. Step 3: Cross multiply
    68,708.40x = 103,066.68 × 21,327.96
  4. Step 4: Simplify right side
    68,708.40x = 2,198,202,028.37
  5. Step 5: Solve for x
    x = 2,198,202,028.37/68,708.40
  6. Step 6: Final answer
    x = 31,993.21

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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.