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Finding the Fourth Proportional to 407.18, 609.89 and 378.69

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Solution

The fourth proportional to 407.18, 609.89 and 378.69 is: 567.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.18 : 609.89 = 378.69 : x
  2. Step 2: Convert to fraction form
    407.18/609.89 = 378.69/x
  3. Step 3: Cross multiply
    407.18x = 609.89 × 378.69
  4. Step 4: Simplify right side
    407.18x = 230,957.35
  5. Step 5: Solve for x
    x = 230,957.35/407.18
  6. Step 6: Final answer
    x = 567.22

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