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Finding the Fourth Proportional to 81,392, 122,642.61 and 66,925

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Solution

The fourth proportional to 81,392, 122,642.61 and 66,925 is: 100,843.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,392 : 122,642.61 = 66,925 : x
  2. Step 2: Convert to fraction form
    81,392/122,642.61 = 66,925/x
  3. Step 3: Cross multiply
    81,392x = 122,642.61 × 66,925
  4. Step 4: Simplify right side
    81,392x = 8,207,856,674.25
  5. Step 5: Solve for x
    x = 8,207,856,674.25/81,392
  6. Step 6: Final answer
    x = 100,843.53

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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.