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Finding the Fourth Proportional to 84,451.92, 126,668.43 and 21,272.01

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Solution

The fourth proportional to 84,451.92, 126,668.43 and 21,272.01 is: 31,905.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,451.92 : 126,668.43 = 21,272.01 : x
  2. Step 2: Convert to fraction form
    84,451.92/126,668.43 = 21,272.01/x
  3. Step 3: Cross multiply
    84,451.92x = 126,668.43 × 21,272.01
  4. Step 4: Simplify right side
    84,451.92x = 2,694,492,109.64
  5. Step 5: Solve for x
    x = 2,694,492,109.64/84,451.92
  6. Step 6: Final answer
    x = 31,905.63

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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.