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Finding the Third Proportional to 5,145.75 and 8,178.75

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Solution

The third proportional to 5,145.75 and 8,178.75 is: 12,999.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,145.75 : 8,178.75 = 8,178.75 : x
  2. Step 2: Convert to fraction form
    5,145.75/8,178.75 = 8,178.75/x
  3. Step 3: Cross multiply
    5,145.75x = 8,178.75 × 8,178.75
  4. Step 4: Simplify right side
    5,145.75x = 66,891,951.56
  5. Step 5: Solve for x
    x = 66,891,951.56/5,145.75
  6. Step 6: Final answer
    x = 12,999.46

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.