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Finding the Third Proportional to 553.75 and 989.38

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Solution

The third proportional to 553.75 and 989.38 is: 1,767.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.75 : 989.38 = 989.38 : x
  2. Step 2: Convert to fraction form
    553.75/989.38 = 989.38/x
  3. Step 3: Cross multiply
    553.75x = 989.38 × 989.38
  4. Step 4: Simplify right side
    553.75x = 978,862.89
  5. Step 5: Solve for x
    x = 978,862.89/553.75
  6. Step 6: Final answer
    x = 1,767.70

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Why These Related Problems?

These problems maintain the same ratio (1.79) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.