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Finding the Third Proportional to 128.25 and 275.19

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Solution

The third proportional to 128.25 and 275.19 is: 590.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.25 : 275.19 = 275.19 : x
  2. Step 2: Convert to fraction form
    128.25/275.19 = 275.19/x
  3. Step 3: Cross multiply
    128.25x = 275.19 × 275.19
  4. Step 4: Simplify right side
    128.25x = 75,728.16
  5. Step 5: Solve for x
    x = 75,728.16/128.25
  6. Step 6: Final answer
    x = 590.47

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.