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Finding the Fourth Proportional to 227.28, 313.64 and 123.78

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Solution

The fourth proportional to 227.28, 313.64 and 123.78 is: 170.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    227.28 : 313.64 = 123.78 : x
  2. Step 2: Convert to fraction form
    227.28/313.64 = 123.78/x
  3. Step 3: Cross multiply
    227.28x = 313.64 × 123.78
  4. Step 4: Simplify right side
    227.28x = 38,822.36
  5. Step 5: Solve for x
    x = 38,822.36/227.28
  6. Step 6: Final answer
    x = 170.81

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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.