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Finding the Third Proportional to 9.87 and 14.20

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Solution

The third proportional to 9.87 and 14.20 is: 20.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.87 : 14.20 = 14.20 : x
  2. Step 2: Convert to fraction form
    9.87/14.20 = 14.20/x
  3. Step 3: Cross multiply
    9.87x = 14.20 × 14.20
  4. Step 4: Simplify right side
    9.87x = 201.50
  5. Step 5: Solve for x
    x = 201.50/9.87
  6. Step 6: Final answer
    x = 20.41

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.