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Finding the Fourth Proportional to 55,979.43, 83,991.03 and 20,910.90

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Solution

The fourth proportional to 55,979.43, 83,991.03 and 20,910.90 is: 31,374.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,979.43 : 83,991.03 = 20,910.90 : x
  2. Step 2: Convert to fraction form
    55,979.43/83,991.03 = 20,910.90/x
  3. Step 3: Cross multiply
    55,979.43x = 83,991.03 × 20,910.90
  4. Step 4: Simplify right side
    55,979.43x = 1,756,328,029.23
  5. Step 5: Solve for x
    x = 1,756,328,029.23/55,979.43
  6. Step 6: Final answer
    x = 31,374.53

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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.