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Finding the Fourth Proportional to 161.76, 223.32 and 138.48

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Solution

The fourth proportional to 161.76, 223.32 and 138.48 is: 191.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.76 : 223.32 = 138.48 : x
  2. Step 2: Convert to fraction form
    161.76/223.32 = 138.48/x
  3. Step 3: Cross multiply
    161.76x = 223.32 × 138.48
  4. Step 4: Simplify right side
    161.76x = 30,925.35
  5. Step 5: Solve for x
    x = 30,925.35/161.76
  6. Step 6: Final answer
    x = 191.18

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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.