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Finding the Fourth Proportional to 118.53, 163.31 and 90.99

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Solution

The fourth proportional to 118.53, 163.31 and 90.99 is: 125.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.53 : 163.31 = 90.99 : x
  2. Step 2: Convert to fraction form
    118.53/163.31 = 90.99/x
  3. Step 3: Cross multiply
    118.53x = 163.31 × 90.99
  4. Step 4: Simplify right side
    118.53x = 14,859.12
  5. Step 5: Solve for x
    x = 14,859.12/118.53
  6. Step 6: Final answer
    x = 125.36

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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.