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Finding the Fourth Proportional to 226.49, 312.56 and 128.23

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Solution

The fourth proportional to 226.49, 312.56 and 128.23 is: 176.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.49 : 312.56 = 128.23 : x
  2. Step 2: Convert to fraction form
    226.49/312.56 = 128.23/x
  3. Step 3: Cross multiply
    226.49x = 312.56 × 128.23
  4. Step 4: Simplify right side
    226.49x = 40,078.01
  5. Step 5: Solve for x
    x = 40,078.01/226.49
  6. Step 6: Final answer
    x = 176.95

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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.