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Finding the Fourth Proportional to 393.80, 590.35 and 211.32

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Solution

The fourth proportional to 393.80, 590.35 and 211.32 is: 316.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.80 : 590.35 = 211.32 : x
  2. Step 2: Convert to fraction form
    393.80/590.35 = 211.32/x
  3. Step 3: Cross multiply
    393.80x = 590.35 × 211.32
  4. Step 4: Simplify right side
    393.80x = 124,752.76
  5. Step 5: Solve for x
    x = 124,752.76/393.80
  6. Step 6: Final answer
    x = 316.79

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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.