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Finding the Fourth Proportional to 1,328.10, 1,992.57 and 403.75

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Solution

The fourth proportional to 1,328.10, 1,992.57 and 403.75 is: 605.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.10 : 1,992.57 = 403.75 : x
  2. Step 2: Convert to fraction form
    1,328.10/1,992.57 = 403.75/x
  3. Step 3: Cross multiply
    1,328.10x = 1,992.57 × 403.75
  4. Step 4: Simplify right side
    1,328.10x = 804,500.14
  5. Step 5: Solve for x
    x = 804,500.14/1,328.10
  6. Step 6: Final answer
    x = 605.75

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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.