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Finding the Fourth Proportional to 428.85, 643.32 and 154.92

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Solution

The fourth proportional to 428.85, 643.32 and 154.92 is: 232.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.85 : 643.32 = 154.92 : x
  2. Step 2: Convert to fraction form
    428.85/643.32 = 154.92/x
  3. Step 3: Cross multiply
    428.85x = 643.32 × 154.92
  4. Step 4: Simplify right side
    428.85x = 99,663.13
  5. Step 5: Solve for x
    x = 99,663.13/428.85
  6. Step 6: Final answer
    x = 232.40

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