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Finding the Fourth Proportional to 163.62, 225.21 and 139.26

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Solution

The fourth proportional to 163.62, 225.21 and 139.26 is: 191.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.62 : 225.21 = 139.26 : x
  2. Step 2: Convert to fraction form
    163.62/225.21 = 139.26/x
  3. Step 3: Cross multiply
    163.62x = 225.21 × 139.26
  4. Step 4: Simplify right side
    163.62x = 31,362.74
  5. Step 5: Solve for x
    x = 31,362.74/163.62
  6. Step 6: Final answer
    x = 191.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.