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Finding the Third Proportional to 643.36 and 885.94

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Solution

The third proportional to 643.36 and 885.94 is: 1,219.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.36 : 885.94 = 885.94 : x
  2. Step 2: Convert to fraction form
    643.36/885.94 = 885.94/x
  3. Step 3: Cross multiply
    643.36x = 885.94 × 885.94
  4. Step 4: Simplify right side
    643.36x = 784,885.25
  5. Step 5: Solve for x
    x = 784,885.25/643.36
  6. Step 6: Final answer
    x = 1,219.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.