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Finding the Third Proportional to 271.50 and 640.25

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Solution

The third proportional to 271.50 and 640.25 is: 1,509.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.50 : 640.25 = 640.25 : x
  2. Step 2: Convert to fraction form
    271.50/640.25 = 640.25/x
  3. Step 3: Cross multiply
    271.50x = 640.25 × 640.25
  4. Step 4: Simplify right side
    271.50x = 409,920.06
  5. Step 5: Solve for x
    x = 409,920.06/271.50
  6. Step 6: Final answer
    x = 1,509.83

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.