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Finding the Fourth Proportional to 219.60, 300.78 and 218.16

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Solution

The fourth proportional to 219.60, 300.78 and 218.16 is: 298.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.60 : 300.78 = 218.16 : x
  2. Step 2: Convert to fraction form
    219.60/300.78 = 218.16/x
  3. Step 3: Cross multiply
    219.60x = 300.78 × 218.16
  4. Step 4: Simplify right side
    219.60x = 65,618.16
  5. Step 5: Solve for x
    x = 65,618.16/219.60
  6. Step 6: Final answer
    x = 298.81

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.