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Finding the Fourth Proportional to 611.45, 843.86 and 401.79

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Solution

The fourth proportional to 611.45, 843.86 and 401.79 is: 554.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.45 : 843.86 = 401.79 : x
  2. Step 2: Convert to fraction form
    611.45/843.86 = 401.79/x
  3. Step 3: Cross multiply
    611.45x = 843.86 × 401.79
  4. Step 4: Simplify right side
    611.45x = 339,052.50
  5. Step 5: Solve for x
    x = 339,052.50/611.45
  6. Step 6: Final answer
    x = 554.51

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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.