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Finding the Fourth Proportional to 1,363.39, 2,045.45 and 389.57

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Solution

The fourth proportional to 1,363.39, 2,045.45 and 389.57 is: 584.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,363.39 : 2,045.45 = 389.57 : x
  2. Step 2: Convert to fraction form
    1,363.39/2,045.45 = 389.57/x
  3. Step 3: Cross multiply
    1,363.39x = 2,045.45 × 389.57
  4. Step 4: Simplify right side
    1,363.39x = 796,845.96
  5. Step 5: Solve for x
    x = 796,845.96/1,363.39
  6. Step 6: Final answer
    x = 584.46

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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.