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Finding the Fourth Proportional to 226.72, 312.96 and 139.38

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Solution

The fourth proportional to 226.72, 312.96 and 139.38 is: 192.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.72 : 312.96 = 139.38 : x
  2. Step 2: Convert to fraction form
    226.72/312.96 = 139.38/x
  3. Step 3: Cross multiply
    226.72x = 312.96 × 139.38
  4. Step 4: Simplify right side
    226.72x = 43,620.36
  5. Step 5: Solve for x
    x = 43,620.36/226.72
  6. Step 6: Final answer
    x = 192.40

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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.