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Finding the Fourth Proportional to 163.56, 245.10 and 86.43

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Solution

The fourth proportional to 163.56, 245.10 and 86.43 is: 129.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.56 : 245.10 = 86.43 : x
  2. Step 2: Convert to fraction form
    163.56/245.10 = 86.43/x
  3. Step 3: Cross multiply
    163.56x = 245.10 × 86.43
  4. Step 4: Simplify right side
    163.56x = 21,183.99
  5. Step 5: Solve for x
    x = 21,183.99/163.56
  6. Step 6: Final answer
    x = 129.52

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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.