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Finding the Fourth Proportional to 1,039.97, 1,560.02 and 390.71

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Solution

The fourth proportional to 1,039.97, 1,560.02 and 390.71 is: 586.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.97 : 1,560.02 = 390.71 : x
  2. Step 2: Convert to fraction form
    1,039.97/1,560.02 = 390.71/x
  3. Step 3: Cross multiply
    1,039.97x = 1,560.02 × 390.71
  4. Step 4: Simplify right side
    1,039.97x = 609,513.46
  5. Step 5: Solve for x
    x = 609,513.46/1,039.97
  6. Step 6: Final answer
    x = 586.09

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