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Finding the Fourth Proportional to 81,396.75, 122,649.74 and 66,929.73

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Solution

The fourth proportional to 81,396.75, 122,649.74 and 66,929.73 is: 100,850.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,396.75 : 122,649.74 = 66,929.73 : x
  2. Step 2: Convert to fraction form
    81,396.75/122,649.74 = 66,929.73/x
  3. Step 3: Cross multiply
    81,396.75x = 122,649.74 × 66,929.73
  4. Step 4: Simplify right side
    81,396.75x = 8,208,913,648.12
  5. Step 5: Solve for x
    x = 8,208,913,648.12/81,396.75
  6. Step 6: Final answer
    x = 100,850.63

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1.5x scale

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.