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Finding the Fourth Proportional to 154.06, 230.78 and 131.28

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Solution

The fourth proportional to 154.06, 230.78 and 131.28 is: 196.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.06 : 230.78 = 131.28 : x
  2. Step 2: Convert to fraction form
    154.06/230.78 = 131.28/x
  3. Step 3: Cross multiply
    154.06x = 230.78 × 131.28
  4. Step 4: Simplify right side
    154.06x = 30,296.80
  5. Step 5: Solve for x
    x = 30,296.80/154.06
  6. Step 6: Final answer
    x = 196.66

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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.