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Finding the Fourth Proportional to 919.75, 1,380.09 and 371.95

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Solution

The fourth proportional to 919.75, 1,380.09 and 371.95 is: 558.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.75 : 1,380.09 = 371.95 : x
  2. Step 2: Convert to fraction form
    919.75/1,380.09 = 371.95/x
  3. Step 3: Cross multiply
    919.75x = 1,380.09 × 371.95
  4. Step 4: Simplify right side
    919.75x = 513,324.48
  5. Step 5: Solve for x
    x = 513,324.48/919.75
  6. Step 6: Final answer
    x = 558.11

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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.