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Finding the Third Proportional to 261.25 and 390.75

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Solution

The third proportional to 261.25 and 390.75 is: 584.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.25 : 390.75 = 390.75 : x
  2. Step 2: Convert to fraction form
    261.25/390.75 = 390.75/x
  3. Step 3: Cross multiply
    261.25x = 390.75 × 390.75
  4. Step 4: Simplify right side
    261.25x = 152,685.56
  5. Step 5: Solve for x
    x = 152,685.56/261.25
  6. Step 6: Final answer
    x = 584.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.