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Finding the Fourth Proportional to 287.91, 431.91 and 105.39

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Solution

The fourth proportional to 287.91, 431.91 and 105.39 is: 158.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.91 : 431.91 = 105.39 : x
  2. Step 2: Convert to fraction form
    287.91/431.91 = 105.39/x
  3. Step 3: Cross multiply
    287.91x = 431.91 × 105.39
  4. Step 4: Simplify right side
    287.91x = 45,518.99
  5. Step 5: Solve for x
    x = 45,518.99/287.91
  6. Step 6: Final answer
    x = 158.10

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