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Finding the Fourth Proportional to 91,180.80, 136,540.80 and 72,748.80

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Solution

The fourth proportional to 91,180.80, 136,540.80 and 72,748.80 is: 108,939.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,180.80 : 136,540.80 = 72,748.80 : x
  2. Step 2: Convert to fraction form
    91,180.80/136,540.80 = 72,748.80/x
  3. Step 3: Cross multiply
    91,180.80x = 136,540.80 × 72,748.80
  4. Step 4: Simplify right side
    91,180.80x = 9,933,179,351.04
  5. Step 5: Solve for x
    x = 9,933,179,351.04/91,180.80
  6. Step 6: Final answer
    x = 108,939.37

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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.