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Finding the Fourth Proportional to 162.15, 223.76 and 138.80

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Solution

The fourth proportional to 162.15, 223.76 and 138.80 is: 191.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.15 : 223.76 = 138.80 : x
  2. Step 2: Convert to fraction form
    162.15/223.76 = 138.80/x
  3. Step 3: Cross multiply
    162.15x = 223.76 × 138.80
  4. Step 4: Simplify right side
    162.15x = 31,057.89
  5. Step 5: Solve for x
    x = 31,057.89/162.15
  6. Step 6: Final answer
    x = 191.54

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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.