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Finding the Fourth Proportional to 391.11, 539.73 and 214.07

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Solution

The fourth proportional to 391.11, 539.73 and 214.07 is: 295.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.11 : 539.73 = 214.07 : x
  2. Step 2: Convert to fraction form
    391.11/539.73 = 214.07/x
  3. Step 3: Cross multiply
    391.11x = 539.73 × 214.07
  4. Step 4: Simplify right side
    391.11x = 115,537.30
  5. Step 5: Solve for x
    x = 115,537.30/391.11
  6. Step 6: Final answer
    x = 295.41

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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.