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Finding the Fourth Proportional to 112.51, 155.21 and 68.23

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Solution

The fourth proportional to 112.51, 155.21 and 68.23 is: 94.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.51 : 155.21 = 68.23 : x
  2. Step 2: Convert to fraction form
    112.51/155.21 = 68.23/x
  3. Step 3: Cross multiply
    112.51x = 155.21 × 68.23
  4. Step 4: Simplify right side
    112.51x = 10,589.20
  5. Step 5: Solve for x
    x = 10,589.20/112.51
  6. Step 6: Final answer
    x = 94.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.