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Finding the Fourth Proportional to 611.42, 843.24 and 401.36

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Solution

The fourth proportional to 611.42, 843.24 and 401.36 is: 553.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.42 : 843.24 = 401.36 : x
  2. Step 2: Convert to fraction form
    611.42/843.24 = 401.36/x
  3. Step 3: Cross multiply
    611.42x = 843.24 × 401.36
  4. Step 4: Simplify right side
    611.42x = 338,442.81
  5. Step 5: Solve for x
    x = 338,442.81/611.42
  6. Step 6: Final answer
    x = 553.54

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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.