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Finding the Fourth Proportional to 160.81, 221.91 and 90.85

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Solution

The fourth proportional to 160.81, 221.91 and 90.85 is: 125.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.81 : 221.91 = 90.85 : x
  2. Step 2: Convert to fraction form
    160.81/221.91 = 90.85/x
  3. Step 3: Cross multiply
    160.81x = 221.91 × 90.85
  4. Step 4: Simplify right side
    160.81x = 20,160.52
  5. Step 5: Solve for x
    x = 20,160.52/160.81
  6. Step 6: Final answer
    x = 125.37

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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.