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Finding the Third Proportional to 687 and 902.25

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Solution

The third proportional to 687 and 902.25 is: 1,184.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    687 : 902.25 = 902.25 : x
  2. Step 2: Convert to fraction form
    687/902.25 = 902.25/x
  3. Step 3: Cross multiply
    687x = 902.25 × 902.25
  4. Step 4: Simplify right side
    687x = 814,055.06
  5. Step 5: Solve for x
    x = 814,055.06/687
  6. Step 6: Final answer
    x = 1,184.94

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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.