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Finding the Fourth Proportional to 39,799, 54,921.70 and 21,893.84

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Solution

The fourth proportional to 39,799, 54,921.70 and 21,893.84 is: 30,212.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,799 : 54,921.70 = 21,893.84 : x
  2. Step 2: Convert to fraction form
    39,799/54,921.70 = 21,893.84/x
  3. Step 3: Cross multiply
    39,799x = 54,921.70 × 21,893.84
  4. Step 4: Simplify right side
    39,799x = 1,202,446,912.33
  5. Step 5: Solve for x
    x = 1,202,446,912.33/39,799
  6. Step 6: Final answer
    x = 30,212.99

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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.