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Finding the Fourth Proportional to 393.20, 591.40 and 335.60

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Solution

The fourth proportional to 393.20, 591.40 and 335.60 is: 504.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.20 : 591.40 = 335.60 : x
  2. Step 2: Convert to fraction form
    393.20/591.40 = 335.60/x
  3. Step 3: Cross multiply
    393.20x = 591.40 × 335.60
  4. Step 4: Simplify right side
    393.20x = 198,473.84
  5. Step 5: Solve for x
    x = 198,473.84/393.20
  6. Step 6: Final answer
    x = 504.77

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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.