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Finding the Fourth Proportional to 109.80, 163.85 and 93.80

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Solution

The fourth proportional to 109.80, 163.85 and 93.80 is: 139.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.80 : 163.85 = 93.80 : x
  2. Step 2: Convert to fraction form
    109.80/163.85 = 93.80/x
  3. Step 3: Cross multiply
    109.80x = 163.85 × 93.80
  4. Step 4: Simplify right side
    109.80x = 15,369.13
  5. Step 5: Solve for x
    x = 15,369.13/109.80
  6. Step 6: Final answer
    x = 139.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.