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Finding the Fourth Proportional to 969.80, 1,338.39 and 550.22

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Solution

The fourth proportional to 969.80, 1,338.39 and 550.22 is: 759.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.80 : 1,338.39 = 550.22 : x
  2. Step 2: Convert to fraction form
    969.80/1,338.39 = 550.22/x
  3. Step 3: Cross multiply
    969.80x = 1,338.39 × 550.22
  4. Step 4: Simplify right side
    969.80x = 736,402.25
  5. Step 5: Solve for x
    x = 736,402.25/969.80
  6. Step 6: Final answer
    x = 759.34

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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.