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Finding the Fourth Proportional to 161.28, 221.76 and 135.36

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Solution

The fourth proportional to 161.28, 221.76 and 135.36 is: 186.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.28 : 221.76 = 135.36 : x
  2. Step 2: Convert to fraction form
    161.28/221.76 = 135.36/x
  3. Step 3: Cross multiply
    161.28x = 221.76 × 135.36
  4. Step 4: Simplify right side
    161.28x = 30,017.43
  5. Step 5: Solve for x
    x = 30,017.43/161.28
  6. Step 6: Final answer
    x = 186.12

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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.