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Finding the Fourth Proportional to 387.91, 581.59 and 205.39

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Solution

The fourth proportional to 387.91, 581.59 and 205.39 is: 307.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.91 : 581.59 = 205.39 : x
  2. Step 2: Convert to fraction form
    387.91/581.59 = 205.39/x
  3. Step 3: Cross multiply
    387.91x = 581.59 × 205.39
  4. Step 4: Simplify right side
    387.91x = 119,452.77
  5. Step 5: Solve for x
    x = 119,452.77/387.91
  6. Step 6: Final answer
    x = 307.94

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