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Finding the Fourth Proportional to 161, 221.52 and 140.20

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Solution

The fourth proportional to 161, 221.52 and 140.20 is: 192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    161 : 221.52 = 140.20 : x
  2. Step 2: Convert to fraction form
    161/221.52 = 140.20/x
  3. Step 3: Cross multiply
    161x = 221.52 × 140.20
  4. Step 4: Simplify right side
    161x = 31,057.10
  5. Step 5: Solve for x
    x = 31,057.10/161
  6. Step 6: Final answer
    x = 192.90

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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.