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Finding the Fourth Proportional to 1,328.98, 1,993.57 and 404.61

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Solution

The fourth proportional to 1,328.98, 1,993.57 and 404.61 is: 606.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.98 : 1,993.57 = 404.61 : x
  2. Step 2: Convert to fraction form
    1,328.98/1,993.57 = 404.61/x
  3. Step 3: Cross multiply
    1,328.98x = 1,993.57 × 404.61
  4. Step 4: Simplify right side
    1,328.98x = 806,621.82
  5. Step 5: Solve for x
    x = 806,621.82/1,328.98
  6. Step 6: Final answer
    x = 606.95

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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.