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Finding the Fourth Proportional to 154.20, 212.71 and 95.21

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Solution

The fourth proportional to 154.20, 212.71 and 95.21 is: 131.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.20 : 212.71 = 95.21 : x
  2. Step 2: Convert to fraction form
    154.20/212.71 = 95.21/x
  3. Step 3: Cross multiply
    154.20x = 212.71 × 95.21
  4. Step 4: Simplify right side
    154.20x = 20,251.79
  5. Step 5: Solve for x
    x = 20,251.79/154.20
  6. Step 6: Final answer
    x = 131.33

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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.