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Finding the Third Proportional to 1.39 and 2.10

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Solution

The third proportional to 1.39 and 2.10 is: 3.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.39 : 2.10 = 2.10 : x
  2. Step 2: Convert to fraction form
    1.39/2.10 = 2.10/x
  3. Step 3: Cross multiply
    1.39x = 2.10 × 2.10
  4. Step 4: Simplify right side
    1.39x = 4.42
  5. Step 5: Solve for x
    x = 4.42/1.39
  6. Step 6: Final answer
    x = 3.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.