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Finding the Fourth Proportional to 611.35, 842.81 and 401.15

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Solution

The fourth proportional to 611.35, 842.81 and 401.15 is: 553.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.35 : 842.81 = 401.15 : x
  2. Step 2: Convert to fraction form
    611.35/842.81 = 401.15/x
  3. Step 3: Cross multiply
    611.35x = 842.81 × 401.15
  4. Step 4: Simplify right side
    611.35x = 338,093.33
  5. Step 5: Solve for x
    x = 338,093.33/611.35
  6. Step 6: Final answer
    x = 553.03

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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.