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Finding the Third Proportional to 249.13 and 392.94

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Solution

The third proportional to 249.13 and 392.94 is: 619.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.13 : 392.94 = 392.94 : x
  2. Step 2: Convert to fraction form
    249.13/392.94 = 392.94/x
  3. Step 3: Cross multiply
    249.13x = 392.94 × 392.94
  4. Step 4: Simplify right side
    249.13x = 154,399.88
  5. Step 5: Solve for x
    x = 154,399.88/249.13
  6. Step 6: Final answer
    x = 619.77

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.