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Finding the Third Proportional to 218.75 and 339.50

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Solution

The third proportional to 218.75 and 339.50 is: 526.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.75 : 339.50 = 339.50 : x
  2. Step 2: Convert to fraction form
    218.75/339.50 = 339.50/x
  3. Step 3: Cross multiply
    218.75x = 339.50 × 339.50
  4. Step 4: Simplify right side
    218.75x = 115,260.25
  5. Step 5: Solve for x
    x = 115,260.25/218.75
  6. Step 6: Final answer
    x = 526.90

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.