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Finding the Fourth Proportional to 1,328.90, 1,993.19 and 355.07

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Solution

The fourth proportional to 1,328.90, 1,993.19 and 355.07 is: 532.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.90 : 1,993.19 = 355.07 : x
  2. Step 2: Convert to fraction form
    1,328.90/1,993.19 = 355.07/x
  3. Step 3: Cross multiply
    1,328.90x = 1,993.19 × 355.07
  4. Step 4: Simplify right side
    1,328.90x = 707,721.97
  5. Step 5: Solve for x
    x = 707,721.97/1,328.90
  6. Step 6: Final answer
    x = 532.56

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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.