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Finding the Fourth Proportional to 154.17, 231.30 and 77.22

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Solution

The fourth proportional to 154.17, 231.30 and 77.22 is: 115.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.17 : 231.30 = 77.22 : x
  2. Step 2: Convert to fraction form
    154.17/231.30 = 77.22/x
  3. Step 3: Cross multiply
    154.17x = 231.30 × 77.22
  4. Step 4: Simplify right side
    154.17x = 17,860.99
  5. Step 5: Solve for x
    x = 17,860.99/154.17
  6. Step 6: Final answer
    x = 115.85

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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.