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Finding the Third Proportional to 418.50 and 913

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Solution

The third proportional to 418.50 and 913 is: 1,991.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.50 : 913 = 913 : x
  2. Step 2: Convert to fraction form
    418.50/913 = 913/x
  3. Step 3: Cross multiply
    418.50x = 913 × 913
  4. Step 4: Simplify right side
    418.50x = 833,569
  5. Step 5: Solve for x
    x = 833,569/418.50
  6. Step 6: Final answer
    x = 1,991.80

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.