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Finding the Fourth Proportional to 969.85, 1,338.09 and 550.18

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Solution

The fourth proportional to 969.85, 1,338.09 and 550.18 is: 759.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.85 : 1,338.09 = 550.18 : x
  2. Step 2: Convert to fraction form
    969.85/1,338.09 = 550.18/x
  3. Step 3: Cross multiply
    969.85x = 1,338.09 × 550.18
  4. Step 4: Simplify right side
    969.85x = 736,183.67
  5. Step 5: Solve for x
    x = 736,183.67/969.85
  6. Step 6: Final answer
    x = 759.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.