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Finding the Fourth Proportional to 285.80, 394.45 and 167.78

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Solution

The fourth proportional to 285.80, 394.45 and 167.78 is: 231.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.80 : 394.45 = 167.78 : x
  2. Step 2: Convert to fraction form
    285.80/394.45 = 167.78/x
  3. Step 3: Cross multiply
    285.80x = 394.45 × 167.78
  4. Step 4: Simplify right side
    285.80x = 66,178.85
  5. Step 5: Solve for x
    x = 66,178.85/285.80
  6. Step 6: Final answer
    x = 231.56

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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.