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Finding the Fourth Proportional to 112.20, 168.20 and 57.99

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Solution

The fourth proportional to 112.20, 168.20 and 57.99 is: 86.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.20 : 168.20 = 57.99 : x
  2. Step 2: Convert to fraction form
    112.20/168.20 = 57.99/x
  3. Step 3: Cross multiply
    112.20x = 168.20 × 57.99
  4. Step 4: Simplify right side
    112.20x = 9,753.43
  5. Step 5: Solve for x
    x = 9,753.43/112.20
  6. Step 6: Final answer
    x = 86.93

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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.