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Finding the Fourth Proportional to 162.21, 243.43 and 121.74

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Solution

The fourth proportional to 162.21, 243.43 and 121.74 is: 182.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.21 : 243.43 = 121.74 : x
  2. Step 2: Convert to fraction form
    162.21/243.43 = 121.74/x
  3. Step 3: Cross multiply
    162.21x = 243.43 × 121.74
  4. Step 4: Simplify right side
    162.21x = 29,633.34
  5. Step 5: Solve for x
    x = 29,633.34/162.21
  6. Step 6: Final answer
    x = 182.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.