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Finding the Fourth Proportional to 919.82, 1,379.70 and 371.99

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Solution

The fourth proportional to 919.82, 1,379.70 and 371.99 is: 557.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.82 : 1,379.70 = 371.99 : x
  2. Step 2: Convert to fraction form
    919.82/1,379.70 = 371.99/x
  3. Step 3: Cross multiply
    919.82x = 1,379.70 × 371.99
  4. Step 4: Simplify right side
    919.82x = 513,227.70
  5. Step 5: Solve for x
    x = 513,227.70/919.82
  6. Step 6: Final answer
    x = 557.97

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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.