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Finding the Fourth Proportional to 39,990.54, 55,179.72 and 22,990.80

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Solution

The fourth proportional to 39,990.54, 55,179.72 and 22,990.80 is: 31,723.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,990.54 : 55,179.72 = 22,990.80 : x
  2. Step 2: Convert to fraction form
    39,990.54/55,179.72 = 22,990.80/x
  3. Step 3: Cross multiply
    39,990.54x = 55,179.72 × 22,990.80
  4. Step 4: Simplify right side
    39,990.54x = 1,268,625,906.58
  5. Step 5: Solve for x
    x = 1,268,625,906.58/39,990.54
  6. Step 6: Final answer
    x = 31,723.15

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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.