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Finding the Fourth Proportional to 1,328.89, 1,993.30 and 355

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Solution

The fourth proportional to 1,328.89, 1,993.30 and 355 is: 532.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.89 : 1,993.30 = 355 : x
  2. Step 2: Convert to fraction form
    1,328.89/1,993.30 = 355/x
  3. Step 3: Cross multiply
    1,328.89x = 1,993.30 × 355
  4. Step 4: Simplify right side
    1,328.89x = 707,621.50
  5. Step 5: Solve for x
    x = 707,621.50/1,328.89
  6. Step 6: Final answer
    x = 532.49

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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.