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Finding the Fourth Proportional to 284.90, 427.24 and 111.55

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Solution

The fourth proportional to 284.90, 427.24 and 111.55 is: 167.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.90 : 427.24 = 111.55 : x
  2. Step 2: Convert to fraction form
    284.90/427.24 = 111.55/x
  3. Step 3: Cross multiply
    284.90x = 427.24 × 111.55
  4. Step 4: Simplify right side
    284.90x = 47,658.62
  5. Step 5: Solve for x
    x = 47,658.62/284.90
  6. Step 6: Final answer
    x = 167.28

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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.