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Finding the Fourth Proportional to 216.39, 298.61 and 118.15

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Solution

The fourth proportional to 216.39, 298.61 and 118.15 is: 163.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.39 : 298.61 = 118.15 : x
  2. Step 2: Convert to fraction form
    216.39/298.61 = 118.15/x
  3. Step 3: Cross multiply
    216.39x = 298.61 × 118.15
  4. Step 4: Simplify right side
    216.39x = 35,279.28
  5. Step 5: Solve for x
    x = 35,279.28/216.39
  6. Step 6: Final answer
    x = 163.04

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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.