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Finding the Third Proportional to 383.91 and 642.94

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Solution

The third proportional to 383.91 and 642.94 is: 1,076.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.91 : 642.94 = 642.94 : x
  2. Step 2: Convert to fraction form
    383.91/642.94 = 642.94/x
  3. Step 3: Cross multiply
    383.91x = 642.94 × 642.94
  4. Step 4: Simplify right side
    383.91x = 413,368.63
  5. Step 5: Solve for x
    x = 413,368.63/383.91
  6. Step 6: Final answer
    x = 1,076.74

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.