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Finding the Fourth Proportional to 17.78, 26.66 and 15.91

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Solution

The fourth proportional to 17.78, 26.66 and 15.91 is: 23.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.78 : 26.66 = 15.91 : x
  2. Step 2: Convert to fraction form
    17.78/26.66 = 15.91/x
  3. Step 3: Cross multiply
    17.78x = 26.66 × 15.91
  4. Step 4: Simplify right side
    17.78x = 424.13
  5. Step 5: Solve for x
    x = 424.13/17.78
  6. Step 6: Final answer
    x = 23.86

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