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Finding the Fourth Proportional to 2.49, 3.71 and 1.91

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Solution

The fourth proportional to 2.49, 3.71 and 1.91 is: 2.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.49 : 3.71 = 1.91 : x
  2. Step 2: Convert to fraction form
    2.49/3.71 = 1.91/x
  3. Step 3: Cross multiply
    2.49x = 3.71 × 1.91
  4. Step 4: Simplify right side
    2.49x = 7.10
  5. Step 5: Solve for x
    x = 7.10/2.49
  6. Step 6: Final answer
    x = 2.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.