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Finding the Fourth Proportional to 285.41, 427.95 and 111.97

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Solution

The fourth proportional to 285.41, 427.95 and 111.97 is: 167.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.41 : 427.95 = 111.97 : x
  2. Step 2: Convert to fraction form
    285.41/427.95 = 111.97/x
  3. Step 3: Cross multiply
    285.41x = 427.95 × 111.97
  4. Step 4: Simplify right side
    285.41x = 47,917.56
  5. Step 5: Solve for x
    x = 47,917.56/285.41
  6. Step 6: Final answer
    x = 167.89

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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.