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Finding the Third Proportional to 256.25 and 282.50

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Solution

The third proportional to 256.25 and 282.50 is: 311.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.25 : 282.50 = 282.50 : x
  2. Step 2: Convert to fraction form
    256.25/282.50 = 282.50/x
  3. Step 3: Cross multiply
    256.25x = 282.50 × 282.50
  4. Step 4: Simplify right side
    256.25x = 79,806.25
  5. Step 5: Solve for x
    x = 79,806.25/256.25
  6. Step 6: Final answer
    x = 311.44

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.