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Finding the Third Proportional to 28.79 and 61.70

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Solution

The third proportional to 28.79 and 61.70 is: 132.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.79 : 61.70 = 61.70 : x
  2. Step 2: Convert to fraction form
    28.79/61.70 = 61.70/x
  3. Step 3: Cross multiply
    28.79x = 61.70 × 61.70
  4. Step 4: Simplify right side
    28.79x = 3,806.79
  5. Step 5: Solve for x
    x = 3,806.79/28.79
  6. Step 6: Final answer
    x = 132.21

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.