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Finding the Third Proportional to 261.50 and 386.75

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Solution

The third proportional to 261.50 and 386.75 is: 571.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.50 : 386.75 = 386.75 : x
  2. Step 2: Convert to fraction form
    261.50/386.75 = 386.75/x
  3. Step 3: Cross multiply
    261.50x = 386.75 × 386.75
  4. Step 4: Simplify right side
    261.50x = 149,575.56
  5. Step 5: Solve for x
    x = 149,575.56/261.50
  6. Step 6: Final answer
    x = 571.99

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.