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Finding the Fourth Proportional to 39,694.82, 54,780.80 and 21,789.64

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Solution

The fourth proportional to 39,694.82, 54,780.80 and 21,789.64 is: 30,070.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,694.82 : 54,780.80 = 21,789.64 : x
  2. Step 2: Convert to fraction form
    39,694.82/54,780.80 = 21,789.64/x
  3. Step 3: Cross multiply
    39,694.82x = 54,780.80 × 21,789.64
  4. Step 4: Simplify right side
    39,694.82x = 1,193,653,910.91
  5. Step 5: Solve for x
    x = 1,193,653,910.91/39,694.82
  6. Step 6: Final answer
    x = 30,070.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.