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Finding the Third Proportional to 9 and 21.38

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Solution

The third proportional to 9 and 21.38 is: 50.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    9 : 21.38 = 21.38 : x
  2. Step 2: Convert to fraction form
    9/21.38 = 21.38/x
  3. Step 3: Cross multiply
    9x = 21.38 × 21.38
  4. Step 4: Simplify right side
    9x = 456.89
  5. Step 5: Solve for x
    x = 456.89/9
  6. Step 6: Final answer
    x = 50.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.