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Finding the Fourth Proportional to 286.22, 428.90 and 209.34

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Solution

The fourth proportional to 286.22, 428.90 and 209.34 is: 313.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.22 : 428.90 = 209.34 : x
  2. Step 2: Convert to fraction form
    286.22/428.90 = 209.34/x
  3. Step 3: Cross multiply
    286.22x = 428.90 × 209.34
  4. Step 4: Simplify right side
    286.22x = 89,785.93
  5. Step 5: Solve for x
    x = 89,785.93/286.22
  6. Step 6: Final answer
    x = 313.70

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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.