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Finding the Fourth Proportional to 969.83, 1,338.40 and 550.20

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Solution

The fourth proportional to 969.83, 1,338.40 and 550.20 is: 759.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.83 : 1,338.40 = 550.20 : x
  2. Step 2: Convert to fraction form
    969.83/1,338.40 = 550.20/x
  3. Step 3: Cross multiply
    969.83x = 1,338.40 × 550.20
  4. Step 4: Simplify right side
    969.83x = 736,386.91
  5. Step 5: Solve for x
    x = 736,386.91/969.83
  6. Step 6: Final answer
    x = 759.29

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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.