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Finding the Fourth Proportional to 159.31, 219.76 and 121.94

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Solution

The fourth proportional to 159.31, 219.76 and 121.94 is: 168.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.31 : 219.76 = 121.94 : x
  2. Step 2: Convert to fraction form
    159.31/219.76 = 121.94/x
  3. Step 3: Cross multiply
    159.31x = 219.76 × 121.94
  4. Step 4: Simplify right side
    159.31x = 26,797.53
  5. Step 5: Solve for x
    x = 26,797.53/159.31
  6. Step 6: Final answer
    x = 168.21

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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.