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Finding the Fourth Proportional to 163.58, 245.30 and 86.50

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Solution

The fourth proportional to 163.58, 245.30 and 86.50 is: 129.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.58 : 245.30 = 86.50 : x
  2. Step 2: Convert to fraction form
    163.58/245.30 = 86.50/x
  3. Step 3: Cross multiply
    163.58x = 245.30 × 86.50
  4. Step 4: Simplify right side
    163.58x = 21,217.22
  5. Step 5: Solve for x
    x = 21,217.22/163.58
  6. Step 6: Final answer
    x = 129.71

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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.