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Finding the Third Proportional to 261.75 and 319.13

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Solution

The third proportional to 261.75 and 319.13 is: 389.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.75 : 319.13 = 319.13 : x
  2. Step 2: Convert to fraction form
    261.75/319.13 = 319.13/x
  3. Step 3: Cross multiply
    261.75x = 319.13 × 319.13
  4. Step 4: Simplify right side
    261.75x = 101,840.77
  5. Step 5: Solve for x
    x = 101,840.77/261.75
  6. Step 6: Final answer
    x = 389.08

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Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.