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Finding the Fourth Proportional to 112.44, 168.64 and 40.32

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Solution

The fourth proportional to 112.44, 168.64 and 40.32 is: 60.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.44 : 168.64 = 40.32 : x
  2. Step 2: Convert to fraction form
    112.44/168.64 = 40.32/x
  3. Step 3: Cross multiply
    112.44x = 168.64 × 40.32
  4. Step 4: Simplify right side
    112.44x = 6,799.56
  5. Step 5: Solve for x
    x = 6,799.56/112.44
  6. Step 6: Final answer
    x = 60.47

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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.