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Finding the Fourth Proportional to 394.18, 590.46 and 220.84

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Solution

The fourth proportional to 394.18, 590.46 and 220.84 is: 330.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.18 : 590.46 = 220.84 : x
  2. Step 2: Convert to fraction form
    394.18/590.46 = 220.84/x
  3. Step 3: Cross multiply
    394.18x = 590.46 × 220.84
  4. Step 4: Simplify right side
    394.18x = 130,397.19
  5. Step 5: Solve for x
    x = 130,397.19/394.18
  6. Step 6: Final answer
    x = 330.81

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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.