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Finding the Third Proportional to 4,430 and 7,131

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Solution

The third proportional to 4,430 and 7,131 is: 11,478.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,430 : 7,131 = 7,131 : x
  2. Step 2: Convert to fraction form
    4,430/7,131 = 7,131/x
  3. Step 3: Cross multiply
    4,430x = 7,131 × 7,131
  4. Step 4: Simplify right side
    4,430x = 50,851,161
  5. Step 5: Solve for x
    x = 50,851,161/4,430
  6. Step 6: Final answer
    x = 11,478.82

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.