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Finding the Fourth Proportional to 394.11, 591.36 and 211.32

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Solution

The fourth proportional to 394.11, 591.36 and 211.32 is: 317.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.11 : 591.36 = 211.32 : x
  2. Step 2: Convert to fraction form
    394.11/591.36 = 211.32/x
  3. Step 3: Cross multiply
    394.11x = 591.36 × 211.32
  4. Step 4: Simplify right side
    394.11x = 124,966.20
  5. Step 5: Solve for x
    x = 124,966.20/394.11
  6. Step 6: Final answer
    x = 317.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.