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Finding the Fourth Proportional to 2,151.94, 3,228.16 and 919.49

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Solution

The fourth proportional to 2,151.94, 3,228.16 and 919.49 is: 1,379.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.94 : 3,228.16 = 919.49 : x
  2. Step 2: Convert to fraction form
    2,151.94/3,228.16 = 919.49/x
  3. Step 3: Cross multiply
    2,151.94x = 3,228.16 × 919.49
  4. Step 4: Simplify right side
    2,151.94x = 2,968,260.84
  5. Step 5: Solve for x
    x = 2,968,260.84/2,151.94
  6. Step 6: Final answer
    x = 1,379.34

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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.