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Finding the Fourth Proportional to 110,719.20, 166,078.80 and 81,194.70

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Solution

The fourth proportional to 110,719.20, 166,078.80 and 81,194.70 is: 121,792.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    110,719.20 : 166,078.80 = 81,194.70 : x
  2. Step 2: Convert to fraction form
    110,719.20/166,078.80 = 81,194.70/x
  3. Step 3: Cross multiply
    110,719.20x = 166,078.80 × 81,194.70
  4. Step 4: Simplify right side
    110,719.20x = 13,484,718,342.36
  5. Step 5: Solve for x
    x = 13,484,718,342.36/110,719.20
  6. Step 6: Final answer
    x = 121,792.05

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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.