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Finding the Fourth Proportional to 53,991.30, 80,927.55 and 18,912.90

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Solution

The fourth proportional to 53,991.30, 80,927.55 and 18,912.90 is: 28,348.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,991.30 : 80,927.55 = 18,912.90 : x
  2. Step 2: Convert to fraction form
    53,991.30/80,927.55 = 18,912.90/x
  3. Step 3: Cross multiply
    53,991.30x = 80,927.55 × 18,912.90
  4. Step 4: Simplify right side
    53,991.30x = 1,530,574,660.40
  5. Step 5: Solve for x
    x = 1,530,574,660.40/53,991.30
  6. Step 6: Final answer
    x = 28,348.54

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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.