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Finding the Fourth Proportional to 74.76, 111.86 and 53.34

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Solution

The fourth proportional to 74.76, 111.86 and 53.34 is: 79.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.76 : 111.86 = 53.34 : x
  2. Step 2: Convert to fraction form
    74.76/111.86 = 53.34/x
  3. Step 3: Cross multiply
    74.76x = 111.86 × 53.34
  4. Step 4: Simplify right side
    74.76x = 5,966.61
  5. Step 5: Solve for x
    x = 5,966.61/74.76
  6. Step 6: Final answer
    x = 79.81

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