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Finding the Third Proportional to 668.78 and 887.63

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Solution

The third proportional to 668.78 and 887.63 is: 1,178.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.78 : 887.63 = 887.63 : x
  2. Step 2: Convert to fraction form
    668.78/887.63 = 887.63/x
  3. Step 3: Cross multiply
    668.78x = 887.63 × 887.63
  4. Step 4: Simplify right side
    668.78x = 787,878.14
  5. Step 5: Solve for x
    x = 787,878.14/668.78
  6. Step 6: Final answer
    x = 1,178.08

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.