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Finding the Fourth Proportional to 81,789.39, 122,686.79 and 21,817.26

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Solution

The fourth proportional to 81,789.39, 122,686.79 and 21,817.26 is: 32,726.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,789.39 : 122,686.79 = 21,817.26 : x
  2. Step 2: Convert to fraction form
    81,789.39/122,686.79 = 21,817.26/x
  3. Step 3: Cross multiply
    81,789.39x = 122,686.79 × 21,817.26
  4. Step 4: Simplify right side
    81,789.39x = 2,676,689,486.91
  5. Step 5: Solve for x
    x = 2,676,689,486.91/81,789.39
  6. Step 6: Final answer
    x = 32,726.61

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1.5x scale

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.