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Finding the Third Proportional to 640 and 913

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Solution

The third proportional to 640 and 913 is: 1,302.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    640 : 913 = 913 : x
  2. Step 2: Convert to fraction form
    640/913 = 913/x
  3. Step 3: Cross multiply
    640x = 913 × 913
  4. Step 4: Simplify right side
    640x = 833,569
  5. Step 5: Solve for x
    x = 833,569/640
  6. Step 6: Final answer
    x = 1,302.45

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.