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Finding the Fourth Proportional to 163.36, 245.18 and 86.40

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Solution

The fourth proportional to 163.36, 245.18 and 86.40 is: 129.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.36 : 245.18 = 86.40 : x
  2. Step 2: Convert to fraction form
    163.36/245.18 = 86.40/x
  3. Step 3: Cross multiply
    163.36x = 245.18 × 86.40
  4. Step 4: Simplify right side
    163.36x = 21,183.55
  5. Step 5: Solve for x
    x = 21,183.55/163.36
  6. Step 6: Final answer
    x = 129.67

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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.