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Finding the Third Proportional to 640.50 and 1,248

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Solution

The third proportional to 640.50 and 1,248 is: 2,431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.50 : 1,248 = 1,248 : x
  2. Step 2: Convert to fraction form
    640.50/1,248 = 1,248/x
  3. Step 3: Cross multiply
    640.50x = 1,248 × 1,248
  4. Step 4: Simplify right side
    640.50x = 1,557,504
  5. Step 5: Solve for x
    x = 1,557,504/640.50
  6. Step 6: Final answer
    x = 2,431.70

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.