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Finding the Third Proportional to 74.66 and 162.78

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Solution

The third proportional to 74.66 and 162.78 is: 354.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.66 : 162.78 = 162.78 : x
  2. Step 2: Convert to fraction form
    74.66/162.78 = 162.78/x
  3. Step 3: Cross multiply
    74.66x = 162.78 × 162.78
  4. Step 4: Simplify right side
    74.66x = 26,497.74
  5. Step 5: Solve for x
    x = 26,497.74/74.66
  6. Step 6: Final answer
    x = 354.93

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.