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Finding the Fourth Proportional to 81,135.69, 121,637.67 and 33,786.21

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Solution

The fourth proportional to 81,135.69, 121,637.67 and 33,786.21 is: 50,651.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,135.69 : 121,637.67 = 33,786.21 : x
  2. Step 2: Convert to fraction form
    81,135.69/121,637.67 = 33,786.21/x
  3. Step 3: Cross multiply
    81,135.69x = 121,637.67 × 33,786.21
  4. Step 4: Simplify right side
    81,135.69x = 4,109,675,862.53
  5. Step 5: Solve for x
    x = 4,109,675,862.53/81,135.69
  6. Step 6: Final answer
    x = 50,651.89

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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.