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Finding the Third Proportional to 18 and 40

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Solution

The third proportional to 18 and 40 is: 88.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18 : 40 = 40 : x
  2. Step 2: Convert to fraction form
    18/40 = 40/x
  3. Step 3: Cross multiply
    18x = 40 × 40
  4. Step 4: Simplify right side
    18x = 1,600
  5. Step 5: Solve for x
    x = 1,600/18
  6. Step 6: Final answer
    x = 88.89

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.