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Finding the Fourth Proportional to 118.81, 163.95 and 72.19

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Solution

The fourth proportional to 118.81, 163.95 and 72.19 is: 99.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.81 : 163.95 = 72.19 : x
  2. Step 2: Convert to fraction form
    118.81/163.95 = 72.19/x
  3. Step 3: Cross multiply
    118.81x = 163.95 × 72.19
  4. Step 4: Simplify right side
    118.81x = 11,835.55
  5. Step 5: Solve for x
    x = 11,835.55/118.81
  6. Step 6: Final answer
    x = 99.62

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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.