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Finding the Fourth Proportional to 39,704, 54,791.76 and 21,799.20

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Solution

The fourth proportional to 39,704, 54,791.76 and 21,799.20 is: 30,083.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,704 : 54,791.76 = 21,799.20 : x
  2. Step 2: Convert to fraction form
    39,704/54,791.76 = 21,799.20/x
  3. Step 3: Cross multiply
    39,704x = 54,791.76 × 21,799.20
  4. Step 4: Simplify right side
    39,704x = 1,194,416,534.59
  5. Step 5: Solve for x
    x = 1,194,416,534.59/39,704
  6. Step 6: Final answer
    x = 30,083.03

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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.