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Finding the Fourth Proportional to 39,990, 55,186.20 and 22,326

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Solution

The fourth proportional to 39,990, 55,186.20 and 22,326 is: 30,809.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,990 : 55,186.20 = 22,326 : x
  2. Step 2: Convert to fraction form
    39,990/55,186.20 = 22,326/x
  3. Step 3: Cross multiply
    39,990x = 55,186.20 × 22,326
  4. Step 4: Simplify right side
    39,990x = 1,232,087,101.20
  5. Step 5: Solve for x
    x = 1,232,087,101.20/39,990
  6. Step 6: Final answer
    x = 30,809.88

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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.