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Finding the Third Proportional to 5.15 and 10.99

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Solution

The third proportional to 5.15 and 10.99 is: 23.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.15 : 10.99 = 10.99 : x
  2. Step 2: Convert to fraction form
    5.15/10.99 = 10.99/x
  3. Step 3: Cross multiply
    5.15x = 10.99 × 10.99
  4. Step 4: Simplify right side
    5.15x = 120.69
  5. Step 5: Solve for x
    x = 120.69/5.15
  6. Step 6: Final answer
    x = 23.45

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.