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Finding the Fourth Proportional to 401.78, 554.42 and 227.12

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Solution

The fourth proportional to 401.78, 554.42 and 227.12 is: 313.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.78 : 554.42 = 227.12 : x
  2. Step 2: Convert to fraction form
    401.78/554.42 = 227.12/x
  3. Step 3: Cross multiply
    401.78x = 554.42 × 227.12
  4. Step 4: Simplify right side
    401.78x = 125,917.67
  5. Step 5: Solve for x
    x = 125,917.67/401.78
  6. Step 6: Final answer
    x = 313.40

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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.