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Finding the Fourth Proportional to 226.70, 312.78 and 139.40

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Solution

The fourth proportional to 226.70, 312.78 and 139.40 is: 192.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.70 : 312.78 = 139.40 : x
  2. Step 2: Convert to fraction form
    226.70/312.78 = 139.40/x
  3. Step 3: Cross multiply
    226.70x = 312.78 × 139.40
  4. Step 4: Simplify right side
    226.70x = 43,601.53
  5. Step 5: Solve for x
    x = 43,601.53/226.70
  6. Step 6: Final answer
    x = 192.33

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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.