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Finding the Fourth Proportional to 286.40, 394.52 and 220.72

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Solution

The fourth proportional to 286.40, 394.52 and 220.72 is: 304.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.40 : 394.52 = 220.72 : x
  2. Step 2: Convert to fraction form
    286.40/394.52 = 220.72/x
  3. Step 3: Cross multiply
    286.40x = 394.52 × 220.72
  4. Step 4: Simplify right side
    286.40x = 87,078.45
  5. Step 5: Solve for x
    x = 87,078.45/286.40
  6. Step 6: Final answer
    x = 304.04

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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.