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Finding the Third Proportional to 122.63 and 136.69

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Solution

The third proportional to 122.63 and 136.69 is: 152.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.63 : 136.69 = 136.69 : x
  2. Step 2: Convert to fraction form
    122.63/136.69 = 136.69/x
  3. Step 3: Cross multiply
    122.63x = 136.69 × 136.69
  4. Step 4: Simplify right side
    122.63x = 18,683.47
  5. Step 5: Solve for x
    x = 18,683.47/122.63
  6. Step 6: Final answer
    x = 152.36

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.