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Finding the Fourth Proportional to 154.36, 212.89 and 131.11

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Solution

The fourth proportional to 154.36, 212.89 and 131.11 is: 180.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.36 : 212.89 = 131.11 : x
  2. Step 2: Convert to fraction form
    154.36/212.89 = 131.11/x
  3. Step 3: Cross multiply
    154.36x = 212.89 × 131.11
  4. Step 4: Simplify right side
    154.36x = 27,911.15
  5. Step 5: Solve for x
    x = 27,911.15/154.36
  6. Step 6: Final answer
    x = 180.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.