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Finding the Third Proportional to 4,278 and 6,400

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Solution

The third proportional to 4,278 and 6,400 is: 9,574.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,278 : 6,400 = 6,400 : x
  2. Step 2: Convert to fraction form
    4,278/6,400 = 6,400/x
  3. Step 3: Cross multiply
    4,278x = 6,400 × 6,400
  4. Step 4: Simplify right side
    4,278x = 40,960,000
  5. Step 5: Solve for x
    x = 40,960,000/4,278
  6. Step 6: Final answer
    x = 9,574.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.