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Finding the Fourth Proportional to 209.98, 314.97 and 86.58

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Solution

The fourth proportional to 209.98, 314.97 and 86.58 is: 129.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.98 : 314.97 = 86.58 : x
  2. Step 2: Convert to fraction form
    209.98/314.97 = 86.58/x
  3. Step 3: Cross multiply
    209.98x = 314.97 × 86.58
  4. Step 4: Simplify right side
    209.98x = 27,270.10
  5. Step 5: Solve for x
    x = 27,270.10/209.98
  6. Step 6: Final answer
    x = 129.87

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