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Finding the Fourth Proportional to 285.82, 428.73 and 69.40

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Solution

The fourth proportional to 285.82, 428.73 and 69.40 is: 104.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.82 : 428.73 = 69.40 : x
  2. Step 2: Convert to fraction form
    285.82/428.73 = 69.40/x
  3. Step 3: Cross multiply
    285.82x = 428.73 × 69.40
  4. Step 4: Simplify right side
    285.82x = 29,753.72
  5. Step 5: Solve for x
    x = 29,753.72/285.82
  6. Step 6: Final answer
    x = 104.10

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