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Finding the Third Proportional to 916.78 and 1,245.56

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Solution

The third proportional to 916.78 and 1,245.56 is: 1,692.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.78 : 1,245.56 = 1,245.56 : x
  2. Step 2: Convert to fraction form
    916.78/1,245.56 = 1,245.56/x
  3. Step 3: Cross multiply
    916.78x = 1,245.56 × 1,245.56
  4. Step 4: Simplify right side
    916.78x = 1,551,425.94
  5. Step 5: Solve for x
    x = 1,551,425.94/916.78
  6. Step 6: Final answer
    x = 1,692.25

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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.