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Finding the Fourth Proportional to 162.12, 223.14 and 137.76

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Solution

The fourth proportional to 162.12, 223.14 and 137.76 is: 189.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.12 : 223.14 = 137.76 : x
  2. Step 2: Convert to fraction form
    162.12/223.14 = 137.76/x
  3. Step 3: Cross multiply
    162.12x = 223.14 × 137.76
  4. Step 4: Simplify right side
    162.12x = 30,739.77
  5. Step 5: Solve for x
    x = 30,739.77/162.12
  6. Step 6: Final answer
    x = 189.61

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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.