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Finding the Fourth Proportional to 920.25, 1,379.21 and 451.94

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Solution

The fourth proportional to 920.25, 1,379.21 and 451.94 is: 677.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.25 : 1,379.21 = 451.94 : x
  2. Step 2: Convert to fraction form
    920.25/1,379.21 = 451.94/x
  3. Step 3: Cross multiply
    920.25x = 1,379.21 × 451.94
  4. Step 4: Simplify right side
    920.25x = 623,311.01
  5. Step 5: Solve for x
    x = 623,311.01/920.25
  6. Step 6: Final answer
    x = 677.33

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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.