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Finding the Fourth Proportional to 386.86, 533.93 and 288.89

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Solution

The fourth proportional to 386.86, 533.93 and 288.89 is: 398.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.86 : 533.93 = 288.89 : x
  2. Step 2: Convert to fraction form
    386.86/533.93 = 288.89/x
  3. Step 3: Cross multiply
    386.86x = 533.93 × 288.89
  4. Step 4: Simplify right side
    386.86x = 154,246.93
  5. Step 5: Solve for x
    x = 154,246.93/386.86
  6. Step 6: Final answer
    x = 398.72

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