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Finding the Fourth Proportional to 112.95, 169.15 and 80.37

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Solution

The fourth proportional to 112.95, 169.15 and 80.37 is: 120.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.95 : 169.15 = 80.37 : x
  2. Step 2: Convert to fraction form
    112.95/169.15 = 80.37/x
  3. Step 3: Cross multiply
    112.95x = 169.15 × 80.37
  4. Step 4: Simplify right side
    112.95x = 13,594.59
  5. Step 5: Solve for x
    x = 13,594.59/112.95
  6. Step 6: Final answer
    x = 120.36

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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.