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Finding the Fourth Proportional to 2,739.40, 4,109.10 and 791.80

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Solution

The fourth proportional to 2,739.40, 4,109.10 and 791.80 is: 1,187.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,739.40 : 4,109.10 = 791.80 : x
  2. Step 2: Convert to fraction form
    2,739.40/4,109.10 = 791.80/x
  3. Step 3: Cross multiply
    2,739.40x = 4,109.10 × 791.80
  4. Step 4: Simplify right side
    2,739.40x = 3,253,585.38
  5. Step 5: Solve for x
    x = 3,253,585.38/2,739.40
  6. Step 6: Final answer
    x = 1,187.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.