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Finding the Fourth Proportional to 81,389, 122,638.08 and 66,922

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Solution

The fourth proportional to 81,389, 122,638.08 and 66,922 is: 100,839.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,389 : 122,638.08 = 66,922 : x
  2. Step 2: Convert to fraction form
    81,389/122,638.08 = 66,922/x
  3. Step 3: Cross multiply
    81,389x = 122,638.08 × 66,922
  4. Step 4: Simplify right side
    81,389x = 8,207,185,589.76
  5. Step 5: Solve for x
    x = 8,207,185,589.76/81,389
  6. Step 6: Final answer
    x = 100,839.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.