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Finding the Third Proportional to 4,389 and 5,625

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Solution

The third proportional to 4,389 and 5,625 is: 7,209.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,389 : 5,625 = 5,625 : x
  2. Step 2: Convert to fraction form
    4,389/5,625 = 5,625/x
  3. Step 3: Cross multiply
    4,389x = 5,625 × 5,625
  4. Step 4: Simplify right side
    4,389x = 31,640,625
  5. Step 5: Solve for x
    x = 31,640,625/4,389
  6. Step 6: Final answer
    x = 7,209.07

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.