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Finding the Third Proportional to 1.25 and 1.98

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Solution

The third proportional to 1.25 and 1.98 is: 3.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.25 : 1.98 = 1.98 : x
  2. Step 2: Convert to fraction form
    1.25/1.98 = 1.98/x
  3. Step 3: Cross multiply
    1.25x = 1.98 × 1.98
  4. Step 4: Simplify right side
    1.25x = 3.93
  5. Step 5: Solve for x
    x = 3.93/1.25
  6. Step 6: Final answer
    x = 3.13

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.