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Finding the Fourth Proportional to 161.86, 223.04 and 120.36

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Solution

The fourth proportional to 161.86, 223.04 and 120.36 is: 165.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.86 : 223.04 = 120.36 : x
  2. Step 2: Convert to fraction form
    161.86/223.04 = 120.36/x
  3. Step 3: Cross multiply
    161.86x = 223.04 × 120.36
  4. Step 4: Simplify right side
    161.86x = 26,845.09
  5. Step 5: Solve for x
    x = 26,845.09/161.86
  6. Step 6: Final answer
    x = 165.85

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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.