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Finding the Fourth Proportional to 169,991.15, 255,042.20 and 81,251.57

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Solution

The fourth proportional to 169,991.15, 255,042.20 and 81,251.57 is: 121,903.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,991.15 : 255,042.20 = 81,251.57 : x
  2. Step 2: Convert to fraction form
    169,991.15/255,042.20 = 81,251.57/x
  3. Step 3: Cross multiply
    169,991.15x = 255,042.20 × 81,251.57
  4. Step 4: Simplify right side
    169,991.15x = 20,722,580,006.99
  5. Step 5: Solve for x
    x = 20,722,580,006.99/169,991.15
  6. Step 6: Final answer
    x = 121,903.88

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1.5x scale

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.