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Finding the Fourth Proportional to 185.56, 278.20 and 139.66

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Solution

The fourth proportional to 185.56, 278.20 and 139.66 is: 209.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.56 : 278.20 = 139.66 : x
  2. Step 2: Convert to fraction form
    185.56/278.20 = 139.66/x
  3. Step 3: Cross multiply
    185.56x = 278.20 × 139.66
  4. Step 4: Simplify right side
    185.56x = 38,852.89
  5. Step 5: Solve for x
    x = 38,852.89/185.56
  6. Step 6: Final answer
    x = 209.38

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