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Finding the Fourth Proportional to 112.67, 155.47 and 68.42

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Solution

The fourth proportional to 112.67, 155.47 and 68.42 is: 94.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.67 : 155.47 = 68.42 : x
  2. Step 2: Convert to fraction form
    112.67/155.47 = 68.42/x
  3. Step 3: Cross multiply
    112.67x = 155.47 × 68.42
  4. Step 4: Simplify right side
    112.67x = 10,637.26
  5. Step 5: Solve for x
    x = 10,637.26/112.67
  6. Step 6: Final answer
    x = 94.41

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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.