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Finding the Fourth Proportional to 163.35, 245.21 and 82.17

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Solution

The fourth proportional to 163.35, 245.21 and 82.17 is: 123.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.35 : 245.21 = 82.17 : x
  2. Step 2: Convert to fraction form
    163.35/245.21 = 82.17/x
  3. Step 3: Cross multiply
    163.35x = 245.21 × 82.17
  4. Step 4: Simplify right side
    163.35x = 20,148.49
  5. Step 5: Solve for x
    x = 20,148.49/163.35
  6. Step 6: Final answer
    x = 123.35

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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.