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Finding the Fourth Proportional to 112.21, 168.32 and 39.07

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Solution

The fourth proportional to 112.21, 168.32 and 39.07 is: 58.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.21 : 168.32 = 39.07 : x
  2. Step 2: Convert to fraction form
    112.21/168.32 = 39.07/x
  3. Step 3: Cross multiply
    112.21x = 168.32 × 39.07
  4. Step 4: Simplify right side
    112.21x = 6,576.75
  5. Step 5: Solve for x
    x = 6,576.75/112.21
  6. Step 6: Final answer
    x = 58.61

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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.