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Finding the Third Proportional to 4.29 and 9.21

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Solution

The third proportional to 4.29 and 9.21 is: 19.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.29 : 9.21 = 9.21 : x
  2. Step 2: Convert to fraction form
    4.29/9.21 = 9.21/x
  3. Step 3: Cross multiply
    4.29x = 9.21 × 9.21
  4. Step 4: Simplify right side
    4.29x = 84.84
  5. Step 5: Solve for x
    x = 84.84/4.29
  6. Step 6: Final answer
    x = 19.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.