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Finding the Fourth Proportional to 1,329.10, 1,993.67 and 355.19

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Solution

The fourth proportional to 1,329.10, 1,993.67 and 355.19 is: 532.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.10 : 1,993.67 = 355.19 : x
  2. Step 2: Convert to fraction form
    1,329.10/1,993.67 = 355.19/x
  3. Step 3: Cross multiply
    1,329.10x = 1,993.67 × 355.19
  4. Step 4: Simplify right side
    1,329.10x = 708,131.65
  5. Step 5: Solve for x
    x = 708,131.65/1,329.10
  6. Step 6: Final answer
    x = 532.79

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Double scale
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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.