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Finding the Fourth Proportional to 112.40, 168.62 and 40.28

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Solution

The fourth proportional to 112.40, 168.62 and 40.28 is: 60.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.40 : 168.62 = 40.28 : x
  2. Step 2: Convert to fraction form
    112.40/168.62 = 40.28/x
  3. Step 3: Cross multiply
    112.40x = 168.62 × 40.28
  4. Step 4: Simplify right side
    112.40x = 6,792.01
  5. Step 5: Solve for x
    x = 6,792.01/112.40
  6. Step 6: Final answer
    x = 60.43

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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.