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Finding the Fourth Proportional to 2,791.81, 3,853.10 and 1,672.80

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Solution

The fourth proportional to 2,791.81, 3,853.10 and 1,672.80 is: 2,308.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,791.81 : 3,853.10 = 1,672.80 : x
  2. Step 2: Convert to fraction form
    2,791.81/3,853.10 = 1,672.80/x
  3. Step 3: Cross multiply
    2,791.81x = 3,853.10 × 1,672.80
  4. Step 4: Simplify right side
    2,791.81x = 6,445,446.41
  5. Step 5: Solve for x
    x = 6,445,446.41/2,791.81
  6. Step 6: Final answer
    x = 2,308.70

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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.