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Finding the Fourth Proportional to 154.23, 231.28 and 51.49

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Solution

The fourth proportional to 154.23, 231.28 and 51.49 is: 77.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.23 : 231.28 = 51.49 : x
  2. Step 2: Convert to fraction form
    154.23/231.28 = 51.49/x
  3. Step 3: Cross multiply
    154.23x = 231.28 × 51.49
  4. Step 4: Simplify right side
    154.23x = 11,908.61
  5. Step 5: Solve for x
    x = 11,908.61/154.23
  6. Step 6: Final answer
    x = 77.22

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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.