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Finding the Third Proportional to 5,418 and 7,123

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Solution

The third proportional to 5,418 and 7,123 is: 9,364.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418 : 7,123 = 7,123 : x
  2. Step 2: Convert to fraction form
    5,418/7,123 = 7,123/x
  3. Step 3: Cross multiply
    5,418x = 7,123 × 7,123
  4. Step 4: Simplify right side
    5,418x = 50,737,129
  5. Step 5: Solve for x
    x = 50,737,129/5,418
  6. Step 6: Final answer
    x = 9,364.55

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.