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Finding the Fourth Proportional to 109.37, 163.77 and 91.43

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Solution

The fourth proportional to 109.37, 163.77 and 91.43 is: 136.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.37 : 163.77 = 91.43 : x
  2. Step 2: Convert to fraction form
    109.37/163.77 = 91.43/x
  3. Step 3: Cross multiply
    109.37x = 163.77 × 91.43
  4. Step 4: Simplify right side
    109.37x = 14,973.49
  5. Step 5: Solve for x
    x = 14,973.49/109.37
  6. Step 6: Final answer
    x = 136.91

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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.