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Finding the Fourth Proportional to 154.21, 231.08 and 115.51

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Solution

The fourth proportional to 154.21, 231.08 and 115.51 is: 173.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.21 : 231.08 = 115.51 : x
  2. Step 2: Convert to fraction form
    154.21/231.08 = 115.51/x
  3. Step 3: Cross multiply
    154.21x = 231.08 × 115.51
  4. Step 4: Simplify right side
    154.21x = 26,692.05
  5. Step 5: Solve for x
    x = 26,692.05/154.21
  6. Step 6: Final answer
    x = 173.09

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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.