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Finding the Fourth Proportional to 226.58, 312.66 and 128.30

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Solution

The fourth proportional to 226.58, 312.66 and 128.30 is: 177.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.58 : 312.66 = 128.30 : x
  2. Step 2: Convert to fraction form
    226.58/312.66 = 128.30/x
  3. Step 3: Cross multiply
    226.58x = 312.66 × 128.30
  4. Step 4: Simplify right side
    226.58x = 40,112.71
  5. Step 5: Solve for x
    x = 40,112.71/226.58
  6. Step 6: Final answer
    x = 177.04

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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.