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Finding the Fourth Proportional to 609.91, 914.40 and 198.80

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Solution

The fourth proportional to 609.91, 914.40 and 198.80 is: 298.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.91 : 914.40 = 198.80 : x
  2. Step 2: Convert to fraction form
    609.91/914.40 = 198.80/x
  3. Step 3: Cross multiply
    609.91x = 914.40 × 198.80
  4. Step 4: Simplify right side
    609.91x = 181,782.72
  5. Step 5: Solve for x
    x = 181,782.72/609.91
  6. Step 6: Final answer
    x = 298.05

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