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Finding the Fourth Proportional to 10.00, 13.89 and 9.91

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Solution

The fourth proportional to 10.00, 13.89 and 9.91 is: 13.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.00 : 13.89 = 9.91 : x
  2. Step 2: Convert to fraction form
    10.00/13.89 = 9.91/x
  3. Step 3: Cross multiply
    10.00x = 13.89 × 9.91
  4. Step 4: Simplify right side
    10.00x = 137.70
  5. Step 5: Solve for x
    x = 137.70/10.00
  6. Step 6: Final answer
    x = 13.77

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