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Finding the Fourth Proportional to 112.75, 156.24 and 105.90

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Solution

The fourth proportional to 112.75, 156.24 and 105.90 is: 146.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.75 : 156.24 = 105.90 : x
  2. Step 2: Convert to fraction form
    112.75/156.24 = 105.90/x
  3. Step 3: Cross multiply
    112.75x = 156.24 × 105.90
  4. Step 4: Simplify right side
    112.75x = 16,544.51
  5. Step 5: Solve for x
    x = 16,544.51/112.75
  6. Step 6: Final answer
    x = 146.74

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.