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Finding the Fourth Proportional to 159.89, 239.40 and 121.39

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Solution

The fourth proportional to 159.89, 239.40 and 121.39 is: 181.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.89 : 239.40 = 121.39 : x
  2. Step 2: Convert to fraction form
    159.89/239.40 = 121.39/x
  3. Step 3: Cross multiply
    159.89x = 239.40 × 121.39
  4. Step 4: Simplify right side
    159.89x = 29,060.77
  5. Step 5: Solve for x
    x = 29,060.77/159.89
  6. Step 6: Final answer
    x = 181.75

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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.