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Finding the Fourth Proportional to 387.72, 581.43 and 113.72

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Solution

The fourth proportional to 387.72, 581.43 and 113.72 is: 170.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.72 : 581.43 = 113.72 : x
  2. Step 2: Convert to fraction form
    387.72/581.43 = 113.72/x
  3. Step 3: Cross multiply
    387.72x = 581.43 × 113.72
  4. Step 4: Simplify right side
    387.72x = 66,121.67
  5. Step 5: Solve for x
    x = 66,121.67/387.72
  6. Step 6: Final answer
    x = 170.54

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