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Finding the Third Proportional to 291 and 480

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Solution

The third proportional to 291 and 480 is: 791.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    291 : 480 = 480 : x
  2. Step 2: Convert to fraction form
    291/480 = 480/x
  3. Step 3: Cross multiply
    291x = 480 × 480
  4. Step 4: Simplify right side
    291x = 230,400
  5. Step 5: Solve for x
    x = 230,400/291
  6. Step 6: Final answer
    x = 791.75

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.