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Finding the Fourth Proportional to 393.28, 590.46 and 355.48

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Solution

The fourth proportional to 393.28, 590.46 and 355.48 is: 533.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.28 : 590.46 = 355.48 : x
  2. Step 2: Convert to fraction form
    393.28/590.46 = 355.48/x
  3. Step 3: Cross multiply
    393.28x = 590.46 × 355.48
  4. Step 4: Simplify right side
    393.28x = 209,896.72
  5. Step 5: Solve for x
    x = 209,896.72/393.28
  6. Step 6: Final answer
    x = 533.71

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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.