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Finding the Fourth Proportional to 919.75, 1,378.74 and 303.04

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Solution

The fourth proportional to 919.75, 1,378.74 and 303.04 is: 454.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.75 : 1,378.74 = 303.04 : x
  2. Step 2: Convert to fraction form
    919.75/1,378.74 = 303.04/x
  3. Step 3: Cross multiply
    919.75x = 1,378.74 × 303.04
  4. Step 4: Simplify right side
    919.75x = 417,813.37
  5. Step 5: Solve for x
    x = 417,813.37/919.75
  6. Step 6: Final answer
    x = 454.27

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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.