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Finding the Third Proportional to 172.76 and 276.70

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Solution

The third proportional to 172.76 and 276.70 is: 443.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.76 : 276.70 = 276.70 : x
  2. Step 2: Convert to fraction form
    172.76/276.70 = 276.70/x
  3. Step 3: Cross multiply
    172.76x = 276.70 × 276.70
  4. Step 4: Simplify right side
    172.76x = 76,561.38
  5. Step 5: Solve for x
    x = 76,561.38/172.76
  6. Step 6: Final answer
    x = 443.17

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.