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Finding the Fourth Proportional to 285.36, 394.56 and 219.84

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Solution

The fourth proportional to 285.36, 394.56 and 219.84 is: 303.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.36 : 394.56 = 219.84 : x
  2. Step 2: Convert to fraction form
    285.36/394.56 = 219.84/x
  3. Step 3: Cross multiply
    285.36x = 394.56 × 219.84
  4. Step 4: Simplify right side
    285.36x = 86,740.07
  5. Step 5: Solve for x
    x = 86,740.07/285.36
  6. Step 6: Final answer
    x = 303.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.