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Finding the Fourth Proportional to 81,381.51, 121,949.67 and 72,512.72

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Solution

The fourth proportional to 81,381.51, 121,949.67 and 72,512.72 is: 108,659.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,381.51 : 121,949.67 = 72,512.72 : x
  2. Step 2: Convert to fraction form
    81,381.51/121,949.67 = 72,512.72/x
  3. Step 3: Cross multiply
    81,381.51x = 121,949.67 × 72,512.72
  4. Step 4: Simplify right side
    81,381.51x = 8,842,902,959.75
  5. Step 5: Solve for x
    x = 8,842,902,959.75/81,381.51
  6. Step 6: Final answer
    x = 108,659.85

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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.