Home / 1,285.69-1,928.68-408.04

Finding the Fourth Proportional to 1,285.69, 1,928.68 and 408.04

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Solution

The fourth proportional to 1,285.69, 1,928.68 and 408.04 is: 612.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.69 : 1,928.68 = 408.04 : x
  2. Step 2: Convert to fraction form
    1,285.69/1,928.68 = 408.04/x
  3. Step 3: Cross multiply
    1,285.69x = 1,928.68 × 408.04
  4. Step 4: Simplify right side
    1,285.69x = 786,972.75
  5. Step 5: Solve for x
    x = 786,972.75/1,285.69
  6. Step 6: Final answer
    x = 612.10

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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.