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Finding the Fourth Proportional to 226.72, 312.87 and 128.47

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Solution

The fourth proportional to 226.72, 312.87 and 128.47 is: 177.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.72 : 312.87 = 128.47 : x
  2. Step 2: Convert to fraction form
    226.72/312.87 = 128.47/x
  3. Step 3: Cross multiply
    226.72x = 312.87 × 128.47
  4. Step 4: Simplify right side
    226.72x = 40,193.77
  5. Step 5: Solve for x
    x = 40,193.77/226.72
  6. Step 6: Final answer
    x = 177.29

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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.