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Finding the Fourth Proportional to 642.86, 964.29 and 155.91

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Solution

The fourth proportional to 642.86, 964.29 and 155.91 is: 233.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.86 : 964.29 = 155.91 : x
  2. Step 2: Convert to fraction form
    642.86/964.29 = 155.91/x
  3. Step 3: Cross multiply
    642.86x = 964.29 × 155.91
  4. Step 4: Simplify right side
    642.86x = 150,344.09
  5. Step 5: Solve for x
    x = 150,344.09/642.86
  6. Step 6: Final answer
    x = 233.87

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