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Finding the Fourth Proportional to 919.83, 1,378.74 and 371.73

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Solution

The fourth proportional to 919.83, 1,378.74 and 371.73 is: 557.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.83 : 1,378.74 = 371.73 : x
  2. Step 2: Convert to fraction form
    919.83/1,378.74 = 371.73/x
  3. Step 3: Cross multiply
    919.83x = 1,378.74 × 371.73
  4. Step 4: Simplify right side
    919.83x = 512,519.02
  5. Step 5: Solve for x
    x = 512,519.02/919.83
  6. Step 6: Final answer
    x = 557.19

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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.