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Finding the Fourth Proportional to 160.40, 221.40 and 105.18

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Solution

The fourth proportional to 160.40, 221.40 and 105.18 is: 145.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.40 : 221.40 = 105.18 : x
  2. Step 2: Convert to fraction form
    160.40/221.40 = 105.18/x
  3. Step 3: Cross multiply
    160.40x = 221.40 × 105.18
  4. Step 4: Simplify right side
    160.40x = 23,286.85
  5. Step 5: Solve for x
    x = 23,286.85/160.40
  6. Step 6: Final answer
    x = 145.18

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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.