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Finding the Third Proportional to 480 and 815

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Solution

The third proportional to 480 and 815 is: 1,383.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    480 : 815 = 815 : x
  2. Step 2: Convert to fraction form
    480/815 = 815/x
  3. Step 3: Cross multiply
    480x = 815 × 815
  4. Step 4: Simplify right side
    480x = 664,225
  5. Step 5: Solve for x
    x = 664,225/480
  6. Step 6: Final answer
    x = 1,383.80

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.