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Finding the Fourth Proportional to 5,791.79, 7,992.70 and 3,139.20

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Solution

The fourth proportional to 5,791.79, 7,992.70 and 3,139.20 is: 4,332.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,791.79 : 7,992.70 = 3,139.20 : x
  2. Step 2: Convert to fraction form
    5,791.79/7,992.70 = 3,139.20/x
  3. Step 3: Cross multiply
    5,791.79x = 7,992.70 × 3,139.20
  4. Step 4: Simplify right side
    5,791.79x = 25,090,675.99
  5. Step 5: Solve for x
    x = 25,090,675.99/5,791.79
  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.