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Finding the Fourth Proportional to 81,378.45, 122,067.68 and 22,215.71

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Solution

The fourth proportional to 81,378.45, 122,067.68 and 22,215.71 is: 33,323.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,378.45 : 122,067.68 = 22,215.71 : x
  2. Step 2: Convert to fraction form
    81,378.45/122,067.68 = 22,215.71/x
  3. Step 3: Cross multiply
    81,378.45x = 122,067.68 × 22,215.71
  4. Step 4: Simplify right side
    81,378.45x = 2,711,819,457.84
  5. Step 5: Solve for x
    x = 2,711,819,457.84/81,378.45
  6. Step 6: Final answer
    x = 33,323.56

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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.