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Finding the Third Proportional to 302.50 and 388.75

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Solution

The third proportional to 302.50 and 388.75 is: 499.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.50 : 388.75 = 388.75 : x
  2. Step 2: Convert to fraction form
    302.50/388.75 = 388.75/x
  3. Step 3: Cross multiply
    302.50x = 388.75 × 388.75
  4. Step 4: Simplify right side
    302.50x = 151,126.56
  5. Step 5: Solve for x
    x = 151,126.56/302.50
  6. Step 6: Final answer
    x = 499.59

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.