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Finding the Fourth Proportional to 711.78, 982.21 and 401.22

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Solution

The fourth proportional to 711.78, 982.21 and 401.22 is: 553.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.78 : 982.21 = 401.22 : x
  2. Step 2: Convert to fraction form
    711.78/982.21 = 401.22/x
  3. Step 3: Cross multiply
    711.78x = 982.21 × 401.22
  4. Step 4: Simplify right side
    711.78x = 394,082.30
  5. Step 5: Solve for x
    x = 394,082.30/711.78
  6. Step 6: Final answer
    x = 553.66

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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.