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Finding the Fourth Proportional to 226.42, 312.32 and 138.94

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Solution

The fourth proportional to 226.42, 312.32 and 138.94 is: 191.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.42 : 312.32 = 138.94 : x
  2. Step 2: Convert to fraction form
    226.42/312.32 = 138.94/x
  3. Step 3: Cross multiply
    226.42x = 312.32 × 138.94
  4. Step 4: Simplify right side
    226.42x = 43,393.31
  5. Step 5: Solve for x
    x = 43,393.31/226.42
  6. Step 6: Final answer
    x = 191.65

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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.