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Finding the Fourth Proportional to 226.31, 312.34 and 128.06

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Solution

The fourth proportional to 226.31, 312.34 and 128.06 is: 176.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.31 : 312.34 = 128.06 : x
  2. Step 2: Convert to fraction form
    226.31/312.34 = 128.06/x
  3. Step 3: Cross multiply
    226.31x = 312.34 × 128.06
  4. Step 4: Simplify right side
    226.31x = 39,998.72
  5. Step 5: Solve for x
    x = 39,998.72/226.31
  6. Step 6: Final answer
    x = 176.74

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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.