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Finding the Third Proportional to 487.75 and 553.75

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Solution

The third proportional to 487.75 and 553.75 is: 628.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.75 : 553.75 = 553.75 : x
  2. Step 2: Convert to fraction form
    487.75/553.75 = 553.75/x
  3. Step 3: Cross multiply
    487.75x = 553.75 × 553.75
  4. Step 4: Simplify right side
    487.75x = 306,639.06
  5. Step 5: Solve for x
    x = 306,639.06/487.75
  6. Step 6: Final answer
    x = 628.68

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Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.