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Finding the Fourth Proportional to 405.55, 608.40 and 281.00

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Solution

The fourth proportional to 405.55, 608.40 and 281.00 is: 421.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.55 : 608.40 = 281.00 : x
  2. Step 2: Convert to fraction form
    405.55/608.40 = 281.00/x
  3. Step 3: Cross multiply
    405.55x = 608.40 × 281.00
  4. Step 4: Simplify right side
    405.55x = 170,957.36
  5. Step 5: Solve for x
    x = 170,957.36/405.55
  6. Step 6: Final answer
    x = 421.55

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