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Finding the Fourth Proportional to 920.26, 1,379.22 and 399.70

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Solution

The fourth proportional to 920.26, 1,379.22 and 399.70 is: 599.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.26 : 1,379.22 = 399.70 : x
  2. Step 2: Convert to fraction form
    920.26/1,379.22 = 399.70/x
  3. Step 3: Cross multiply
    920.26x = 1,379.22 × 399.70
  4. Step 4: Simplify right side
    920.26x = 551,274.23
  5. Step 5: Solve for x
    x = 551,274.23/920.26
  6. Step 6: Final answer
    x = 599.04

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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.