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Finding the Fourth Proportional to 1,323.90, 1,986.03 and 399.42

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Solution

The fourth proportional to 1,323.90, 1,986.03 and 399.42 is: 599.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.90 : 1,986.03 = 399.42 : x
  2. Step 2: Convert to fraction form
    1,323.90/1,986.03 = 399.42/x
  3. Step 3: Cross multiply
    1,323.90x = 1,986.03 × 399.42
  4. Step 4: Simplify right side
    1,323.90x = 793,260.10
  5. Step 5: Solve for x
    x = 793,260.10/1,323.90
  6. Step 6: Final answer
    x = 599.18

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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.