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Finding the Third Proportional to 640.50 and 903.75

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Solution

The third proportional to 640.50 and 903.75 is: 1,275.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.50 : 903.75 = 903.75 : x
  2. Step 2: Convert to fraction form
    640.50/903.75 = 903.75/x
  3. Step 3: Cross multiply
    640.50x = 903.75 × 903.75
  4. Step 4: Simplify right side
    640.50x = 816,764.06
  5. Step 5: Solve for x
    x = 816,764.06/640.50
  6. Step 6: Final answer
    x = 1,275.20

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.