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Finding the Fourth Proportional to 161.64, 221.64 and 159.48

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Solution

The fourth proportional to 161.64, 221.64 and 159.48 is: 218.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.64 : 221.64 = 159.48 : x
  2. Step 2: Convert to fraction form
    161.64/221.64 = 159.48/x
  3. Step 3: Cross multiply
    161.64x = 221.64 × 159.48
  4. Step 4: Simplify right side
    161.64x = 35,347.15
  5. Step 5: Solve for x
    x = 35,347.15/161.64
  6. Step 6: Final answer
    x = 218.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.