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Finding the Fourth Proportional to 145.22, 217.86 and 53.91

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Solution

The fourth proportional to 145.22, 217.86 and 53.91 is: 80.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.22 : 217.86 = 53.91 : x
  2. Step 2: Convert to fraction form
    145.22/217.86 = 53.91/x
  3. Step 3: Cross multiply
    145.22x = 217.86 × 53.91
  4. Step 4: Simplify right side
    145.22x = 11,744.83
  5. Step 5: Solve for x
    x = 11,744.83/145.22
  6. Step 6: Final answer
    x = 80.88

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