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Finding the Third Proportional to 640.88 and 907.69

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Solution

The third proportional to 640.88 and 907.69 is: 1,285.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.88 : 907.69 = 907.69 : x
  2. Step 2: Convert to fraction form
    640.88/907.69 = 907.69/x
  3. Step 3: Cross multiply
    640.88x = 907.69 × 907.69
  4. Step 4: Simplify right side
    640.88x = 823,896.60
  5. Step 5: Solve for x
    x = 823,896.60/640.88
  6. Step 6: Final answer
    x = 1,285.58

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These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.