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Finding the Fourth Proportional to 160.72, 221.74 and 111.66

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Solution

The fourth proportional to 160.72, 221.74 and 111.66 is: 154.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.72 : 221.74 = 111.66 : x
  2. Step 2: Convert to fraction form
    160.72/221.74 = 111.66/x
  3. Step 3: Cross multiply
    160.72x = 221.74 × 111.66
  4. Step 4: Simplify right side
    160.72x = 24,759.49
  5. Step 5: Solve for x
    x = 24,759.49/160.72
  6. Step 6: Final answer
    x = 154.05

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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.