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Finding the Fourth Proportional to 226.80, 312.78 and 164.40

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Solution

The fourth proportional to 226.80, 312.78 and 164.40 is: 226.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.80 : 312.78 = 164.40 : x
  2. Step 2: Convert to fraction form
    226.80/312.78 = 164.40/x
  3. Step 3: Cross multiply
    226.80x = 312.78 × 164.40
  4. Step 4: Simplify right side
    226.80x = 51,421.03
  5. Step 5: Solve for x
    x = 51,421.03/226.80
  6. Step 6: Final answer
    x = 226.72

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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.