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Finding the Fourth Proportional to 81,645, 122,471.72 and 22,479.36

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Solution

The fourth proportional to 81,645, 122,471.72 and 22,479.36 is: 33,720.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,645 : 122,471.72 = 22,479.36 : x
  2. Step 2: Convert to fraction form
    81,645/122,471.72 = 22,479.36/x
  3. Step 3: Cross multiply
    81,645x = 122,471.72 × 22,479.36
  4. Step 4: Simplify right side
    81,645x = 2,753,085,883.70
  5. Step 5: Solve for x
    x = 2,753,085,883.70/81,645
  6. Step 6: Final answer
    x = 33,720.20

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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.