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Finding the Fourth Proportional to 73.43, 109.93 and 47.78

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Solution

The fourth proportional to 73.43, 109.93 and 47.78 is: 71.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.43 : 109.93 = 47.78 : x
  2. Step 2: Convert to fraction form
    73.43/109.93 = 47.78/x
  3. Step 3: Cross multiply
    73.43x = 109.93 × 47.78
  4. Step 4: Simplify right side
    73.43x = 5,251.91
  5. Step 5: Solve for x
    x = 5,251.91/73.43
  6. Step 6: Final answer
    x = 71.53

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