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Finding the Third Proportional to 4,378 and 7,111

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Solution

The third proportional to 4,378 and 7,111 is: 11,550.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,378 : 7,111 = 7,111 : x
  2. Step 2: Convert to fraction form
    4,378/7,111 = 7,111/x
  3. Step 3: Cross multiply
    4,378x = 7,111 × 7,111
  4. Step 4: Simplify right side
    4,378x = 50,566,321
  5. Step 5: Solve for x
    x = 50,566,321/4,378
  6. Step 6: Final answer
    x = 11,550.10

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.