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Finding the Third Proportional to 252.56 and 390.94

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Solution

The third proportional to 252.56 and 390.94 is: 605.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.56 : 390.94 = 390.94 : x
  2. Step 2: Convert to fraction form
    252.56/390.94 = 390.94/x
  3. Step 3: Cross multiply
    252.56x = 390.94 × 390.94
  4. Step 4: Simplify right side
    252.56x = 152,832.13
  5. Step 5: Solve for x
    x = 152,832.13/252.56
  6. Step 6: Final answer
    x = 605.13

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.