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Finding the Fourth Proportional to 286.70, 395.54 and 202.80

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Solution

The fourth proportional to 286.70, 395.54 and 202.80 is: 279.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.70 : 395.54 = 202.80 : x
  2. Step 2: Convert to fraction form
    286.70/395.54 = 202.80/x
  3. Step 3: Cross multiply
    286.70x = 395.54 × 202.80
  4. Step 4: Simplify right side
    286.70x = 80,214.50
  5. Step 5: Solve for x
    x = 80,214.50/286.70
  6. Step 6: Final answer
    x = 279.78

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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.