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Finding the Third Proportional to 15 and 45

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Solution

The third proportional to 15 and 45 is: 135

Step by Step Solution

  1. Step 1: Write the proportion equation
    15 : 45 = 45 : x
  2. Step 2: Convert to fraction form
    15/45 = 45/x
  3. Step 3: Cross multiply
    15x = 45 × 45
  4. Step 4: Simplify right side
    15x = 2,025
  5. Step 5: Solve for x
    x = 2,025/15
  6. Step 6: Final answer
    x = 135

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Why These Related Problems?

These problems maintain the same ratio (3) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.