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Finding the Fourth Proportional to 109.41, 163.94 and 72.78

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Solution

The fourth proportional to 109.41, 163.94 and 72.78 is: 109.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.41 : 163.94 = 72.78 : x
  2. Step 2: Convert to fraction form
    109.41/163.94 = 72.78/x
  3. Step 3: Cross multiply
    109.41x = 163.94 × 72.78
  4. Step 4: Simplify right side
    109.41x = 11,931.19
  5. Step 5: Solve for x
    x = 11,931.19/109.41
  6. Step 6: Final answer
    x = 109.05

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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.