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Finding the Third Proportional to 249.94 and 399.84

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Solution

The third proportional to 249.94 and 399.84 is: 639.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.94 : 399.84 = 399.84 : x
  2. Step 2: Convert to fraction form
    249.94/399.84 = 399.84/x
  3. Step 3: Cross multiply
    249.94x = 399.84 × 399.84
  4. Step 4: Simplify right side
    249.94x = 159,875.02
  5. Step 5: Solve for x
    x = 159,875.02/249.94
  6. Step 6: Final answer
    x = 639.66

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.