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Finding the Fourth Proportional to 227.13, 313.44 and 139.78

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Solution

The fourth proportional to 227.13, 313.44 and 139.78 is: 192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    227.13 : 313.44 = 139.78 : x
  2. Step 2: Convert to fraction form
    227.13/313.44 = 139.78/x
  3. Step 3: Cross multiply
    227.13x = 313.44 × 139.78
  4. Step 4: Simplify right side
    227.13x = 43,812.64
  5. Step 5: Solve for x
    x = 43,812.64/227.13
  6. Step 6: Final answer
    x = 192.90

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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.