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Finding the Fourth Proportional to 39,555, 54,585.90 and 21,891

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Solution

The fourth proportional to 39,555, 54,585.90 and 21,891 is: 30,209.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,555 : 54,585.90 = 21,891 : x
  2. Step 2: Convert to fraction form
    39,555/54,585.90 = 21,891/x
  3. Step 3: Cross multiply
    39,555x = 54,585.90 × 21,891
  4. Step 4: Simplify right side
    39,555x = 1,194,939,936.90
  5. Step 5: Solve for x
    x = 1,194,939,936.90/39,555
  6. Step 6: Final answer
    x = 30,209.58

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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.