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Finding the Third Proportional to 128,584 and 199,080

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Solution

The third proportional to 128,584 and 199,080 is: 308,225.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,584 : 199,080 = 199,080 : x
  2. Step 2: Convert to fraction form
    128,584/199,080 = 199,080/x
  3. Step 3: Cross multiply
    128,584x = 199,080 × 199,080
  4. Step 4: Simplify right side
    128,584x = 39,632,846,400
  5. Step 5: Solve for x
    x = 39,632,846,400/128,584
  6. Step 6: Final answer
    x = 308,225.33

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.