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Finding the Third Proportional to 218.75 and 402.50

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Solution

The third proportional to 218.75 and 402.50 is: 740.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.75 : 402.50 = 402.50 : x
  2. Step 2: Convert to fraction form
    218.75/402.50 = 402.50/x
  3. Step 3: Cross multiply
    218.75x = 402.50 × 402.50
  4. Step 4: Simplify right side
    218.75x = 162,006.25
  5. Step 5: Solve for x
    x = 162,006.25/218.75
  6. Step 6: Final answer
    x = 740.60

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.