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Finding the Fourth Proportional to 394.66, 590.16 and 285.31

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Solution

The fourth proportional to 394.66, 590.16 and 285.31 is: 426.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.66 : 590.16 = 285.31 : x
  2. Step 2: Convert to fraction form
    394.66/590.16 = 285.31/x
  3. Step 3: Cross multiply
    394.66x = 590.16 × 285.31
  4. Step 4: Simplify right side
    394.66x = 168,378.55
  5. Step 5: Solve for x
    x = 168,378.55/394.66
  6. Step 6: Final answer
    x = 426.64

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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.