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Finding the Fourth Proportional to 61,262.80, 91,872.60 and 21,821.20

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Solution

The fourth proportional to 61,262.80, 91,872.60 and 21,821.20 is: 32,724.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,262.80 : 91,872.60 = 21,821.20 : x
  2. Step 2: Convert to fraction form
    61,262.80/91,872.60 = 21,821.20/x
  3. Step 3: Cross multiply
    61,262.80x = 91,872.60 × 21,821.20
  4. Step 4: Simplify right side
    61,262.80x = 2,004,770,379.12
  5. Step 5: Solve for x
    x = 2,004,770,379.12/61,262.80
  6. Step 6: Final answer
    x = 32,724.11

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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.