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Finding the Fourth Proportional to 81,939, 122,928 and 26,535

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Solution

The fourth proportional to 81,939, 122,928 and 26,535 is: 39,808.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,939 : 122,928 = 26,535 : x
  2. Step 2: Convert to fraction form
    81,939/122,928 = 26,535/x
  3. Step 3: Cross multiply
    81,939x = 122,928 × 26,535
  4. Step 4: Simplify right side
    81,939x = 3,261,894,480
  5. Step 5: Solve for x
    x = 3,261,894,480/81,939
  6. Step 6: Final answer
    x = 39,808.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.