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Finding the Fourth Proportional to 226.40, 312.34 and 137.85

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Solution

The fourth proportional to 226.40, 312.34 and 137.85 is: 190.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.40 : 312.34 = 137.85 : x
  2. Step 2: Convert to fraction form
    226.40/312.34 = 137.85/x
  3. Step 3: Cross multiply
    226.40x = 312.34 × 137.85
  4. Step 4: Simplify right side
    226.40x = 43,056.57
  5. Step 5: Solve for x
    x = 43,056.57/226.40
  6. Step 6: Final answer
    x = 190.18

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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.