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Finding the Fourth Proportional to 160.81, 221.73 and 121.51

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Solution

The fourth proportional to 160.81, 221.73 and 121.51 is: 167.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.81 : 221.73 = 121.51 : x
  2. Step 2: Convert to fraction form
    160.81/221.73 = 121.51/x
  3. Step 3: Cross multiply
    160.81x = 221.73 × 121.51
  4. Step 4: Simplify right side
    160.81x = 26,942.41
  5. Step 5: Solve for x
    x = 26,942.41/160.81
  6. Step 6: Final answer
    x = 167.54

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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.