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Finding the Fourth Proportional to 61,190.20, 91,785.30 and 21,791.80

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Solution

The fourth proportional to 61,190.20, 91,785.30 and 21,791.80 is: 32,687.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,190.20 : 91,785.30 = 21,791.80 : x
  2. Step 2: Convert to fraction form
    61,190.20/91,785.30 = 21,791.80/x
  3. Step 3: Cross multiply
    61,190.20x = 91,785.30 × 21,791.80
  4. Step 4: Simplify right side
    61,190.20x = 2,000,166,900.54
  5. Step 5: Solve for x
    x = 2,000,166,900.54/61,190.20
  6. Step 6: Final answer
    x = 32,687.70

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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.