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Finding the Fourth Proportional to 1,379.73, 2,069.67 and 455.25

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Solution

The fourth proportional to 1,379.73, 2,069.67 and 455.25 is: 682.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.73 : 2,069.67 = 455.25 : x
  2. Step 2: Convert to fraction form
    1,379.73/2,069.67 = 455.25/x
  3. Step 3: Cross multiply
    1,379.73x = 2,069.67 × 455.25
  4. Step 4: Simplify right side
    1,379.73x = 942,214.99
  5. Step 5: Solve for x
    x = 942,214.99/1,379.73
  6. Step 6: Final answer
    x = 682.90

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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.