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Finding the Third Proportional to 5,405 and 8,628

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Solution

The third proportional to 5,405 and 8,628 is: 13,772.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,405 : 8,628 = 8,628 : x
  2. Step 2: Convert to fraction form
    5,405/8,628 = 8,628/x
  3. Step 3: Cross multiply
    5,405x = 8,628 × 8,628
  4. Step 4: Simplify right side
    5,405x = 74,442,384
  5. Step 5: Solve for x
    x = 74,442,384/5,405
  6. Step 6: Final answer
    x = 13,772.87

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.