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Finding the Third Proportional to 1.31 and 2.91

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Solution

The third proportional to 1.31 and 2.91 is: 6.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.31 : 2.91 = 2.91 : x
  2. Step 2: Convert to fraction form
    1.31/2.91 = 2.91/x
  3. Step 3: Cross multiply
    1.31x = 2.91 × 2.91
  4. Step 4: Simplify right side
    1.31x = 8.45
  5. Step 5: Solve for x
    x = 8.45/1.31
  6. Step 6: Final answer
    x = 6.44

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.