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Finding the Third Proportional to 128.46 and 282.23

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Solution

The third proportional to 128.46 and 282.23 is: 620.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.46 : 282.23 = 282.23 : x
  2. Step 2: Convert to fraction form
    128.46/282.23 = 282.23/x
  3. Step 3: Cross multiply
    128.46x = 282.23 × 282.23
  4. Step 4: Simplify right side
    128.46x = 79,656.24
  5. Step 5: Solve for x
    x = 79,656.24/128.46
  6. Step 6: Final answer
    x = 620.08

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.