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Finding the Third Proportional to 318 and 354

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Solution

The third proportional to 318 and 354 is: 394.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    318 : 354 = 354 : x
  2. Step 2: Convert to fraction form
    318/354 = 354/x
  3. Step 3: Cross multiply
    318x = 354 × 354
  4. Step 4: Simplify right side
    318x = 125,316
  5. Step 5: Solve for x
    x = 125,316/318
  6. Step 6: Final answer
    x = 394.08

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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.