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Finding the Fourth Proportional to 428.76, 642.48 and 212.46

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Solution

The fourth proportional to 428.76, 642.48 and 212.46 is: 318.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.76 : 642.48 = 212.46 : x
  2. Step 2: Convert to fraction form
    428.76/642.48 = 212.46/x
  3. Step 3: Cross multiply
    428.76x = 642.48 × 212.46
  4. Step 4: Simplify right side
    428.76x = 136,501.30
  5. Step 5: Solve for x
    x = 136,501.30/428.76
  6. Step 6: Final answer
    x = 318.36

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