Home / 1,285.50-1,928.39-419.82

Finding the Fourth Proportional to 1,285.50, 1,928.39 and 419.82

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Solution

The fourth proportional to 1,285.50, 1,928.39 and 419.82 is: 629.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.50 : 1,928.39 = 419.82 : x
  2. Step 2: Convert to fraction form
    1,285.50/1,928.39 = 419.82/x
  3. Step 3: Cross multiply
    1,285.50x = 1,928.39 × 419.82
  4. Step 4: Simplify right side
    1,285.50x = 809,574.59
  5. Step 5: Solve for x
    x = 809,574.59/1,285.50
  6. Step 6: Final answer
    x = 629.77

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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.