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Finding the Fourth Proportional to 159.80, 239.70 and 121.76

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Solution

The fourth proportional to 159.80, 239.70 and 121.76 is: 182.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.80 : 239.70 = 121.76 : x
  2. Step 2: Convert to fraction form
    159.80/239.70 = 121.76/x
  3. Step 3: Cross multiply
    159.80x = 239.70 × 121.76
  4. Step 4: Simplify right side
    159.80x = 29,185.87
  5. Step 5: Solve for x
    x = 29,185.87/159.80
  6. Step 6: Final answer
    x = 182.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.