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Finding the Fourth Proportional to 154.97, 213.85 and 87.68

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Solution

The fourth proportional to 154.97, 213.85 and 87.68 is: 120.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.97 : 213.85 = 87.68 : x
  2. Step 2: Convert to fraction form
    154.97/213.85 = 87.68/x
  3. Step 3: Cross multiply
    154.97x = 213.85 × 87.68
  4. Step 4: Simplify right side
    154.97x = 18,750.37
  5. Step 5: Solve for x
    x = 18,750.37/154.97
  6. Step 6: Final answer
    x = 120.99

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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.