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Finding the Third Proportional to 163.69 and 278.72

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Solution

The third proportional to 163.69 and 278.72 is: 474.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.69 : 278.72 = 278.72 : x
  2. Step 2: Convert to fraction form
    163.69/278.72 = 278.72/x
  3. Step 3: Cross multiply
    163.69x = 278.72 × 278.72
  4. Step 4: Simplify right side
    163.69x = 77,684.14
  5. Step 5: Solve for x
    x = 77,684.14/163.69
  6. Step 6: Final answer
    x = 474.59

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.