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Finding the Fourth Proportional to 226.40, 312.40 and 128.15

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Solution

The fourth proportional to 226.40, 312.40 and 128.15 is: 176.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.40 : 312.40 = 128.15 : x
  2. Step 2: Convert to fraction form
    226.40/312.40 = 128.15/x
  3. Step 3: Cross multiply
    226.40x = 312.40 × 128.15
  4. Step 4: Simplify right side
    226.40x = 40,033.83
  5. Step 5: Solve for x
    x = 40,033.83/226.40
  6. Step 6: Final answer
    x = 176.83

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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.