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Finding the Fourth Proportional to 279.81, 386.11 and 161.73

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Solution

The fourth proportional to 279.81, 386.11 and 161.73 is: 223.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.81 : 386.11 = 161.73 : x
  2. Step 2: Convert to fraction form
    279.81/386.11 = 161.73/x
  3. Step 3: Cross multiply
    279.81x = 386.11 × 161.73
  4. Step 4: Simplify right side
    279.81x = 62,444.32
  5. Step 5: Solve for x
    x = 62,444.32/279.81
  6. Step 6: Final answer
    x = 223.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.