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Finding the Fourth Proportional to 154.15, 231.38 and 120.28

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Solution

The fourth proportional to 154.15, 231.38 and 120.28 is: 180.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.15 : 231.38 = 120.28 : x
  2. Step 2: Convert to fraction form
    154.15/231.38 = 120.28/x
  3. Step 3: Cross multiply
    154.15x = 231.38 × 120.28
  4. Step 4: Simplify right side
    154.15x = 27,829.43
  5. Step 5: Solve for x
    x = 27,829.43/154.15
  6. Step 6: Final answer
    x = 180.54

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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.