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Finding the Fourth Proportional to 579.78, 800.15 and 317.81

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Solution

The fourth proportional to 579.78, 800.15 and 317.81 is: 438.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.78 : 800.15 = 317.81 : x
  2. Step 2: Convert to fraction form
    579.78/800.15 = 317.81/x
  3. Step 3: Cross multiply
    579.78x = 800.15 × 317.81
  4. Step 4: Simplify right side
    579.78x = 254,296.08
  5. Step 5: Solve for x
    x = 254,296.08/579.78
  6. Step 6: Final answer
    x = 438.61

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