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Finding the Fourth Proportional to 286, 394.80 and 203.12

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Solution

The fourth proportional to 286, 394.80 and 203.12 is: 280.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    286 : 394.80 = 203.12 : x
  2. Step 2: Convert to fraction form
    286/394.80 = 203.12/x
  3. Step 3: Cross multiply
    286x = 394.80 × 203.12
  4. Step 4: Simplify right side
    286x = 80,191.78
  5. Step 5: Solve for x
    x = 80,191.78/286
  6. Step 6: Final answer
    x = 280.39

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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.