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Finding the Fourth Proportional to 226.98, 313.28 and 128.78

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Solution

The fourth proportional to 226.98, 313.28 and 128.78 is: 177.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.98 : 313.28 = 128.78 : x
  2. Step 2: Convert to fraction form
    226.98/313.28 = 128.78/x
  3. Step 3: Cross multiply
    226.98x = 313.28 × 128.78
  4. Step 4: Simplify right side
    226.98x = 40,341.99
  5. Step 5: Solve for x
    x = 40,341.99/226.98
  6. Step 6: Final answer
    x = 177.73

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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.