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Finding the Fourth Proportional to 1,318.97, 1,978.59 and 394.37

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Solution

The fourth proportional to 1,318.97, 1,978.59 and 394.37 is: 591.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.97 : 1,978.59 = 394.37 : x
  2. Step 2: Convert to fraction form
    1,318.97/1,978.59 = 394.37/x
  3. Step 3: Cross multiply
    1,318.97x = 1,978.59 × 394.37
  4. Step 4: Simplify right side
    1,318.97x = 780,296.54
  5. Step 5: Solve for x
    x = 780,296.54/1,318.97
  6. Step 6: Final answer
    x = 591.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.