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Finding the Fourth Proportional to 612.97, 919.45 and 407.94

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Solution

The fourth proportional to 612.97, 919.45 and 407.94 is: 611.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.97 : 919.45 = 407.94 : x
  2. Step 2: Convert to fraction form
    612.97/919.45 = 407.94/x
  3. Step 3: Cross multiply
    612.97x = 919.45 × 407.94
  4. Step 4: Simplify right side
    612.97x = 375,077.49
  5. Step 5: Solve for x
    x = 375,077.49/612.97
  6. Step 6: Final answer
    x = 611.90

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