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Finding the Third Proportional to 439.97 and 642.94

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Solution

The third proportional to 439.97 and 642.94 is: 939.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.97 : 642.94 = 642.94 : x
  2. Step 2: Convert to fraction form
    439.97/642.94 = 642.94/x
  3. Step 3: Cross multiply
    439.97x = 642.94 × 642.94
  4. Step 4: Simplify right side
    439.97x = 413,368.63
  5. Step 5: Solve for x
    x = 413,368.63/439.97
  6. Step 6: Final answer
    x = 939.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.