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Finding the Fourth Proportional to 163.11, 224.91 and 100.85

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Solution

The fourth proportional to 163.11, 224.91 and 100.85 is: 139.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.11 : 224.91 = 100.85 : x
  2. Step 2: Convert to fraction form
    163.11/224.91 = 100.85/x
  3. Step 3: Cross multiply
    163.11x = 224.91 × 100.85
  4. Step 4: Simplify right side
    163.11x = 22,681.05
  5. Step 5: Solve for x
    x = 22,681.05/163.11
  6. Step 6: Final answer
    x = 139.05

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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.