Home / 39,990.69-55,187.01-22,087.65

Finding the Fourth Proportional to 39,990.69, 55,187.01 and 22,087.65

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Solution

The fourth proportional to 39,990.69, 55,187.01 and 22,087.65 is: 30,480.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,990.69 : 55,187.01 = 22,087.65 : x
  2. Step 2: Convert to fraction form
    39,990.69/55,187.01 = 22,087.65/x
  3. Step 3: Cross multiply
    39,990.69x = 55,187.01 × 22,087.65
  4. Step 4: Simplify right side
    39,990.69x = 1,218,951,361.43
  5. Step 5: Solve for x
    x = 1,218,951,361.43/39,990.69
  6. Step 6: Final answer
    x = 30,480.88

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Half scale
Find fourth proportional to 79,981.38, 110,374.02 and 44,175.30
Double scale
Find fourth proportional to 39,991.69, 55,188.39 and 22,088.65
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.