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Finding the Fourth Proportional to 112.90, 155.79 and 66.25

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Solution

The fourth proportional to 112.90, 155.79 and 66.25 is: 91.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.90 : 155.79 = 66.25 : x
  2. Step 2: Convert to fraction form
    112.90/155.79 = 66.25/x
  3. Step 3: Cross multiply
    112.90x = 155.79 × 66.25
  4. Step 4: Simplify right side
    112.90x = 10,321.09
  5. Step 5: Solve for x
    x = 10,321.09/112.90
  6. Step 6: Final answer
    x = 91.42

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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.