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Finding the Fourth Proportional to 79.78, 119.76 and 52.78

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Solution

The fourth proportional to 79.78, 119.76 and 52.78 is: 79.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.78 : 119.76 = 52.78 : x
  2. Step 2: Convert to fraction form
    79.78/119.76 = 52.78/x
  3. Step 3: Cross multiply
    79.78x = 119.76 × 52.78
  4. Step 4: Simplify right side
    79.78x = 6,320.93
  5. Step 5: Solve for x
    x = 6,320.93/79.78
  6. Step 6: Final answer
    x = 79.23

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