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Finding the Fourth Proportional to 1,363.80, 2,045.08 and 389.67

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Solution

The fourth proportional to 1,363.80, 2,045.08 and 389.67 is: 584.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,363.80 : 2,045.08 = 389.67 : x
  2. Step 2: Convert to fraction form
    1,363.80/2,045.08 = 389.67/x
  3. Step 3: Cross multiply
    1,363.80x = 2,045.08 × 389.67
  4. Step 4: Simplify right side
    1,363.80x = 796,906.32
  5. Step 5: Solve for x
    x = 796,906.32/1,363.80
  6. Step 6: Final answer
    x = 584.33

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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.