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Finding the Fourth Proportional to 39,855, 54,999.90 and 22,191

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Solution

The fourth proportional to 39,855, 54,999.90 and 22,191 is: 30,623.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,855 : 54,999.90 = 22,191 : x
  2. Step 2: Convert to fraction form
    39,855/54,999.90 = 22,191/x
  3. Step 3: Cross multiply
    39,855x = 54,999.90 × 22,191
  4. Step 4: Simplify right side
    39,855x = 1,220,502,780.90
  5. Step 5: Solve for x
    x = 1,220,502,780.90/39,855
  6. Step 6: Final answer
    x = 30,623.58

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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.