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Finding the Fourth Proportional to 919.35, 1,378.80 and 371.25

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Solution

The fourth proportional to 919.35, 1,378.80 and 371.25 is: 556.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.35 : 1,378.80 = 371.25 : x
  2. Step 2: Convert to fraction form
    919.35/1,378.80 = 371.25/x
  3. Step 3: Cross multiply
    919.35x = 1,378.80 × 371.25
  4. Step 4: Simplify right side
    919.35x = 511,879.50
  5. Step 5: Solve for x
    x = 511,879.50/919.35
  6. Step 6: Final answer
    x = 556.78

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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.