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Finding the Fourth Proportional to 216.21, 298.36 and 117.96

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Solution

The fourth proportional to 216.21, 298.36 and 117.96 is: 162.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.21 : 298.36 = 117.96 : x
  2. Step 2: Convert to fraction form
    216.21/298.36 = 117.96/x
  3. Step 3: Cross multiply
    216.21x = 298.36 × 117.96
  4. Step 4: Simplify right side
    216.21x = 35,194.25
  5. Step 5: Solve for x
    x = 35,194.25/216.21
  6. Step 6: Final answer
    x = 162.78

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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.