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Finding the Fourth Proportional to 218.16, 326.76 and 190.80

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Solution

The fourth proportional to 218.16, 326.76 and 190.80 is: 285.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.16 : 326.76 = 190.80 : x
  2. Step 2: Convert to fraction form
    218.16/326.76 = 190.80/x
  3. Step 3: Cross multiply
    218.16x = 326.76 × 190.80
  4. Step 4: Simplify right side
    218.16x = 62,345.81
  5. Step 5: Solve for x
    x = 62,345.81/218.16
  6. Step 6: Final answer
    x = 285.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.