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Finding the Third Proportional to 103,617 and 128,555

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Solution

The third proportional to 103,617 and 128,555 is: 159,494.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,617 : 128,555 = 128,555 : x
  2. Step 2: Convert to fraction form
    103,617/128,555 = 128,555/x
  3. Step 3: Cross multiply
    103,617x = 128,555 × 128,555
  4. Step 4: Simplify right side
    103,617x = 16,526,388,025
  5. Step 5: Solve for x
    x = 16,526,388,025/103,617
  6. Step 6: Final answer
    x = 159,494.95

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Why These Related Problems?

These problems maintain the same ratio (1.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.