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Finding the Fourth Proportional to 300.85, 415.31 and 202.66

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Solution

The fourth proportional to 300.85, 415.31 and 202.66 is: 279.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.85 : 415.31 = 202.66 : x
  2. Step 2: Convert to fraction form
    300.85/415.31 = 202.66/x
  3. Step 3: Cross multiply
    300.85x = 415.31 × 202.66
  4. Step 4: Simplify right side
    300.85x = 84,164.67
  5. Step 5: Solve for x
    x = 84,164.67/300.85
  6. Step 6: Final answer
    x = 279.76

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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.