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Finding the Fourth Proportional to 839.94, 1,259.75 and 312.74

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Solution

The fourth proportional to 839.94, 1,259.75 and 312.74 is: 469.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.94 : 1,259.75 = 312.74 : x
  2. Step 2: Convert to fraction form
    839.94/1,259.75 = 312.74/x
  3. Step 3: Cross multiply
    839.94x = 1,259.75 × 312.74
  4. Step 4: Simplify right side
    839.94x = 393,980.51
  5. Step 5: Solve for x
    x = 393,980.51/839.94
  6. Step 6: Final answer
    x = 469.06

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