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Finding the Fourth Proportional to 160.65, 221.85 and 105.57

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Solution

The fourth proportional to 160.65, 221.85 and 105.57 is: 145.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.65 : 221.85 = 105.57 : x
  2. Step 2: Convert to fraction form
    160.65/221.85 = 105.57/x
  3. Step 3: Cross multiply
    160.65x = 221.85 × 105.57
  4. Step 4: Simplify right side
    160.65x = 23,420.70
  5. Step 5: Solve for x
    x = 23,420.70/160.65
  6. Step 6: Final answer
    x = 145.79

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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.