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Finding the Third Proportional to 640.41 and 869.06

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Solution

The third proportional to 640.41 and 869.06 is: 1,179.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.41 : 869.06 = 869.06 : x
  2. Step 2: Convert to fraction form
    640.41/869.06 = 869.06/x
  3. Step 3: Cross multiply
    640.41x = 869.06 × 869.06
  4. Step 4: Simplify right side
    640.41x = 755,269.63
  5. Step 5: Solve for x
    x = 755,269.63/640.41
  6. Step 6: Final answer
    x = 1,179.36

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.