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Finding the Fourth Proportional to 12,791.97, 17,654.21 and 7,127.64

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Solution

The fourth proportional to 12,791.97, 17,654.21 and 7,127.64 is: 9,836.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,791.97 : 17,654.21 = 7,127.64 : x
  2. Step 2: Convert to fraction form
    12,791.97/17,654.21 = 7,127.64/x
  3. Step 3: Cross multiply
    12,791.97x = 17,654.21 × 7,127.64
  4. Step 4: Simplify right side
    12,791.97x = 125,832,796.07
  5. Step 5: Solve for x
    x = 125,832,796.07/12,791.97
  6. Step 6: Final answer
    x = 9,836.86

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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.