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Finding the Fourth Proportional to 285.15, 427.68 and 111.85

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Solution

The fourth proportional to 285.15, 427.68 and 111.85 is: 167.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.15 : 427.68 = 111.85 : x
  2. Step 2: Convert to fraction form
    285.15/427.68 = 111.85/x
  3. Step 3: Cross multiply
    285.15x = 427.68 × 111.85
  4. Step 4: Simplify right side
    285.15x = 47,834.94
  5. Step 5: Solve for x
    x = 47,834.94/285.15
  6. Step 6: Final answer
    x = 167.75

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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.