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Finding the Third Proportional to 290.25 and 686.25

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Solution

The third proportional to 290.25 and 686.25 is: 1,622.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.25 : 686.25 = 686.25 : x
  2. Step 2: Convert to fraction form
    290.25/686.25 = 686.25/x
  3. Step 3: Cross multiply
    290.25x = 686.25 × 686.25
  4. Step 4: Simplify right side
    290.25x = 470,939.06
  5. Step 5: Solve for x
    x = 470,939.06/290.25
  6. Step 6: Final answer
    x = 1,622.53

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.