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Finding the Third Proportional to 9.15 and 19.74

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Solution

The third proportional to 9.15 and 19.74 is: 42.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.15 : 19.74 = 19.74 : x
  2. Step 2: Convert to fraction form
    9.15/19.74 = 19.74/x
  3. Step 3: Cross multiply
    9.15x = 19.74 × 19.74
  4. Step 4: Simplify right side
    9.15x = 389.49
  5. Step 5: Solve for x
    x = 389.49/9.15
  6. Step 6: Final answer
    x = 42.57

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.