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Finding the Fourth Proportional to 118.55, 163.32 and 90.86

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Solution

The fourth proportional to 118.55, 163.32 and 90.86 is: 125.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.55 : 163.32 = 90.86 : x
  2. Step 2: Convert to fraction form
    118.55/163.32 = 90.86/x
  3. Step 3: Cross multiply
    118.55x = 163.32 × 90.86
  4. Step 4: Simplify right side
    118.55x = 14,838.44
  5. Step 5: Solve for x
    x = 14,838.44/118.55
  6. Step 6: Final answer
    x = 125.17

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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.