Home / 1,286.08-1,928.40-408.42

Finding the Fourth Proportional to 1,286.08, 1,928.40 and 408.42

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Solution

The fourth proportional to 1,286.08, 1,928.40 and 408.42 is: 612.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.08 : 1,928.40 = 408.42 : x
  2. Step 2: Convert to fraction form
    1,286.08/1,928.40 = 408.42/x
  3. Step 3: Cross multiply
    1,286.08x = 1,928.40 × 408.42
  4. Step 4: Simplify right side
    1,286.08x = 787,597.13
  5. Step 5: Solve for x
    x = 787,597.13/1,286.08
  6. Step 6: Final answer
    x = 612.40

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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.