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Finding the Fourth Proportional to 163.38, 245.04 and 81.12

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Solution

The fourth proportional to 163.38, 245.04 and 81.12 is: 121.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.38 : 245.04 = 81.12 : x
  2. Step 2: Convert to fraction form
    163.38/245.04 = 81.12/x
  3. Step 3: Cross multiply
    163.38x = 245.04 × 81.12
  4. Step 4: Simplify right side
    163.38x = 19,877.64
  5. Step 5: Solve for x
    x = 19,877.64/163.38
  6. Step 6: Final answer
    x = 121.67

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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.