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Finding the Third Proportional to 249.19 and 390.94

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Solution

The third proportional to 249.19 and 390.94 is: 613.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.19 : 390.94 = 390.94 : x
  2. Step 2: Convert to fraction form
    249.19/390.94 = 390.94/x
  3. Step 3: Cross multiply
    249.19x = 390.94 × 390.94
  4. Step 4: Simplify right side
    249.19x = 152,832.13
  5. Step 5: Solve for x
    x = 152,832.13/249.19
  6. Step 6: Final answer
    x = 613.32

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.