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Finding the Fourth Proportional to 154.33, 212.85 and 131.08

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Solution

The fourth proportional to 154.33, 212.85 and 131.08 is: 180.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.33 : 212.85 = 131.08 : x
  2. Step 2: Convert to fraction form
    154.33/212.85 = 131.08/x
  3. Step 3: Cross multiply
    154.33x = 212.85 × 131.08
  4. Step 4: Simplify right side
    154.33x = 27,900.38
  5. Step 5: Solve for x
    x = 27,900.38/154.33
  6. Step 6: Final answer
    x = 180.78

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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.