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Finding the Third Proportional to 208.75 and 281.63

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Solution

The third proportional to 208.75 and 281.63 is: 379.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.75 : 281.63 = 281.63 : x
  2. Step 2: Convert to fraction form
    208.75/281.63 = 281.63/x
  3. Step 3: Cross multiply
    208.75x = 281.63 × 281.63
  4. Step 4: Simplify right side
    208.75x = 79,312.64
  5. Step 5: Solve for x
    x = 79,312.64/208.75
  6. Step 6: Final answer
    x = 379.94

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.