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Finding the Third Proportional to 487.75 and 640.50

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Solution

The third proportional to 487.75 and 640.50 is: 841.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.75 : 640.50 = 640.50 : x
  2. Step 2: Convert to fraction form
    487.75/640.50 = 640.50/x
  3. Step 3: Cross multiply
    487.75x = 640.50 × 640.50
  4. Step 4: Simplify right side
    487.75x = 410,240.25
  5. Step 5: Solve for x
    x = 410,240.25/487.75
  6. Step 6: Final answer
    x = 841.09

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.