Home / 2,853.45-4,280.19-905.65

Finding the Fourth Proportional to 2,853.45, 4,280.19 and 905.65

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Solution

The fourth proportional to 2,853.45, 4,280.19 and 905.65 is: 1,358.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,853.45 : 4,280.19 = 905.65 : x
  2. Step 2: Convert to fraction form
    2,853.45/4,280.19 = 905.65/x
  3. Step 3: Cross multiply
    2,853.45x = 4,280.19 × 905.65
  4. Step 4: Simplify right side
    2,853.45x = 3,876,356.03
  5. Step 5: Solve for x
    x = 3,876,356.03/2,853.45
  6. Step 6: Final answer
    x = 1,358.48

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Double scale
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1.5x scale

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.