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Finding the Third Proportional to 318 and 342.50

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Solution

The third proportional to 318 and 342.50 is: 368.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    318 : 342.50 = 342.50 : x
  2. Step 2: Convert to fraction form
    318/342.50 = 342.50/x
  3. Step 3: Cross multiply
    318x = 342.50 × 342.50
  4. Step 4: Simplify right side
    318x = 117,306.25
  5. Step 5: Solve for x
    x = 117,306.25/318
  6. Step 6: Final answer
    x = 368.89

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These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.