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Finding the Fourth Proportional to 118.33, 163.34 and 90.81

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Solution

The fourth proportional to 118.33, 163.34 and 90.81 is: 125.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.33 : 163.34 = 90.81 : x
  2. Step 2: Convert to fraction form
    118.33/163.34 = 90.81/x
  3. Step 3: Cross multiply
    118.33x = 163.34 × 90.81
  4. Step 4: Simplify right side
    118.33x = 14,832.91
  5. Step 5: Solve for x
    x = 14,832.91/118.33
  6. Step 6: Final answer
    x = 125.35

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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.