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Finding the Third Proportional to 315 and 765

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Solution

The third proportional to 315 and 765 is: 1,857.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    315 : 765 = 765 : x
  2. Step 2: Convert to fraction form
    315/765 = 765/x
  3. Step 3: Cross multiply
    315x = 765 × 765
  4. Step 4: Simplify right side
    315x = 585,225
  5. Step 5: Solve for x
    x = 585,225/315
  6. Step 6: Final answer
    x = 1,857.86

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Why These Related Problems?

These problems maintain the same ratio (2.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.