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Finding the Third Proportional to 290 and 427

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Solution

The third proportional to 290 and 427 is: 628.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    290 : 427 = 427 : x
  2. Step 2: Convert to fraction form
    290/427 = 427/x
  3. Step 3: Cross multiply
    290x = 427 × 427
  4. Step 4: Simplify right side
    290x = 182,329
  5. Step 5: Solve for x
    x = 182,329/290
  6. Step 6: Final answer
    x = 628.72

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These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.