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Finding the Third Proportional to 218.67 and 259.17

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Solution

The third proportional to 218.67 and 259.17 is: 307.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.67 : 259.17 = 259.17 : x
  2. Step 2: Convert to fraction form
    218.67/259.17 = 259.17/x
  3. Step 3: Cross multiply
    218.67x = 259.17 × 259.17
  4. Step 4: Simplify right side
    218.67x = 67,170.06
  5. Step 5: Solve for x
    x = 67,170.06/218.67
  6. Step 6: Final answer
    x = 307.17

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Why These Related Problems?

These problems maintain the same ratio (1.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.