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Finding the Third Proportional to 115.75 and 312.88

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Solution

The third proportional to 115.75 and 312.88 is: 845.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.75 : 312.88 = 312.88 : x
  2. Step 2: Convert to fraction form
    115.75/312.88 = 312.88/x
  3. Step 3: Cross multiply
    115.75x = 312.88 × 312.88
  4. Step 4: Simplify right side
    115.75x = 97,890.77
  5. Step 5: Solve for x
    x = 97,890.77/115.75
  6. Step 6: Final answer
    x = 845.71

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Why These Related Problems?

These problems maintain the same ratio (2.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.