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Finding the Fourth Proportional to 394.91, 593.49 and 390.78

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Solution

The fourth proportional to 394.91, 593.49 and 390.78 is: 587.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.91 : 593.49 = 390.78 : x
  2. Step 2: Convert to fraction form
    394.91/593.49 = 390.78/x
  3. Step 3: Cross multiply
    394.91x = 593.49 × 390.78
  4. Step 4: Simplify right side
    394.91x = 231,924.02
  5. Step 5: Solve for x
    x = 231,924.02/394.91
  6. Step 6: Final answer
    x = 587.29

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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.