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Finding the Fourth Proportional to 285.25, 427.60 and 111.91

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Solution

The fourth proportional to 285.25, 427.60 and 111.91 is: 167.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.25 : 427.60 = 111.91 : x
  2. Step 2: Convert to fraction form
    285.25/427.60 = 111.91/x
  3. Step 3: Cross multiply
    285.25x = 427.60 × 111.91
  4. Step 4: Simplify right side
    285.25x = 47,852.72
  5. Step 5: Solve for x
    x = 47,852.72/285.25
  6. Step 6: Final answer
    x = 167.76

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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.