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Finding the Fourth Proportional to 5,791.78, 7,992.66 and 3,139.21

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Solution

The fourth proportional to 5,791.78, 7,992.66 and 3,139.21 is: 4,332.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,791.78 : 7,992.66 = 3,139.21 : x
  2. Step 2: Convert to fraction form
    5,791.78/7,992.66 = 3,139.21/x
  3. Step 3: Cross multiply
    5,791.78x = 7,992.66 × 3,139.21
  4. Step 4: Simplify right side
    5,791.78x = 25,090,638.20
  5. Step 5: Solve for x
    x = 25,090,638.20/5,791.78
  6. Step 6: Final answer
    x = 4,332.11

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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.