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Finding the Third Proportional to 9.88 and 20.50

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Solution

The third proportional to 9.88 and 20.50 is: 42.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.88 : 20.50 = 20.50 : x
  2. Step 2: Convert to fraction form
    9.88/20.50 = 20.50/x
  3. Step 3: Cross multiply
    9.88x = 20.50 × 20.50
  4. Step 4: Simplify right side
    9.88x = 420.25
  5. Step 5: Solve for x
    x = 420.25/9.88
  6. Step 6: Final answer
    x = 42.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.