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Finding the Third Proportional to 218.50 and 317.50

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Solution

The third proportional to 218.50 and 317.50 is: 461.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.50 : 317.50 = 317.50 : x
  2. Step 2: Convert to fraction form
    218.50/317.50 = 317.50/x
  3. Step 3: Cross multiply
    218.50x = 317.50 × 317.50
  4. Step 4: Simplify right side
    218.50x = 100,806.25
  5. Step 5: Solve for x
    x = 100,806.25/218.50
  6. Step 6: Final answer
    x = 461.36

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.