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Finding the Third Proportional to 661.78 and 1,283.06

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Solution

The third proportional to 661.78 and 1,283.06 is: 2,487.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.78 : 1,283.06 = 1,283.06 : x
  2. Step 2: Convert to fraction form
    661.78/1,283.06 = 1,283.06/x
  3. Step 3: Cross multiply
    661.78x = 1,283.06 × 1,283.06
  4. Step 4: Simplify right side
    661.78x = 1,646,249.38
  5. Step 5: Solve for x
    x = 1,646,249.38/661.78
  6. Step 6: Final answer
    x = 2,487.60

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Why These Related Problems?

These problems maintain the same ratio (1.94) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.