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Finding the Third Proportional to 218.75 and 369.38

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Solution

The third proportional to 218.75 and 369.38 is: 623.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.75 : 369.38 = 369.38 : x
  2. Step 2: Convert to fraction form
    218.75/369.38 = 369.38/x
  3. Step 3: Cross multiply
    218.75x = 369.38 × 369.38
  4. Step 4: Simplify right side
    218.75x = 136,437.89
  5. Step 5: Solve for x
    x = 136,437.89/218.75
  6. Step 6: Final answer
    x = 623.72

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Why These Related Problems?

These problems maintain the same ratio (1.69) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.