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Finding the Fourth Proportional to 919.44, 1,378.34 and 456.96

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Solution

The fourth proportional to 919.44, 1,378.34 and 456.96 is: 685.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.44 : 1,378.34 = 456.96 : x
  2. Step 2: Convert to fraction form
    919.44/1,378.34 = 456.96/x
  3. Step 3: Cross multiply
    919.44x = 1,378.34 × 456.96
  4. Step 4: Simplify right side
    919.44x = 629,846.25
  5. Step 5: Solve for x
    x = 629,846.25/919.44
  6. Step 6: Final answer
    x = 685.03

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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.