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Finding the Fourth Proportional to 919.41, 1,379.43 and 399.54

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Solution

The fourth proportional to 919.41, 1,379.43 and 399.54 is: 599.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.41 : 1,379.43 = 399.54 : x
  2. Step 2: Convert to fraction form
    919.41/1,379.43 = 399.54/x
  3. Step 3: Cross multiply
    919.41x = 1,379.43 × 399.54
  4. Step 4: Simplify right side
    919.41x = 551,137.46
  5. Step 5: Solve for x
    x = 551,137.46/919.41
  6. Step 6: Final answer
    x = 599.45

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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.