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Finding the Fourth Proportional to 159.72, 239.38 and 121.08

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Solution

The fourth proportional to 159.72, 239.38 and 121.08 is: 181.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.72 : 239.38 = 121.08 : x
  2. Step 2: Convert to fraction form
    159.72/239.38 = 121.08/x
  3. Step 3: Cross multiply
    159.72x = 239.38 × 121.08
  4. Step 4: Simplify right side
    159.72x = 28,984.13
  5. Step 5: Solve for x
    x = 28,984.13/159.72
  6. Step 6: Final answer
    x = 181.47

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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.