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Finding the Third Proportional to 285 and 316.50

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Solution

The third proportional to 285 and 316.50 is: 351.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    285 : 316.50 = 316.50 : x
  2. Step 2: Convert to fraction form
    285/316.50 = 316.50/x
  3. Step 3: Cross multiply
    285x = 316.50 × 316.50
  4. Step 4: Simplify right side
    285x = 100,172.25
  5. Step 5: Solve for x
    x = 100,172.25/285
  6. Step 6: Final answer
    x = 351.48

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.