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Finding the Fourth Proportional to 81,679.71, 112,728.20 and 49,849.95

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Solution

The fourth proportional to 81,679.71, 112,728.20 and 49,849.95 is: 68,799.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,679.71 : 112,728.20 = 49,849.95 : x
  2. Step 2: Convert to fraction form
    81,679.71/112,728.20 = 49,849.95/x
  3. Step 3: Cross multiply
    81,679.71x = 112,728.20 × 49,849.95
  4. Step 4: Simplify right side
    81,679.71x = 5,619,494,884.34
  5. Step 5: Solve for x
    x = 5,619,494,884.34/81,679.71
  6. Step 6: Final answer
    x = 68,799.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.