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Finding the Fourth Proportional to 1,328.74, 1,993.06 and 451.21

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Solution

The fourth proportional to 1,328.74, 1,993.06 and 451.21 is: 676.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.74 : 1,993.06 = 451.21 : x
  2. Step 2: Convert to fraction form
    1,328.74/1,993.06 = 451.21/x
  3. Step 3: Cross multiply
    1,328.74x = 1,993.06 × 451.21
  4. Step 4: Simplify right side
    1,328.74x = 899,279.78
  5. Step 5: Solve for x
    x = 899,279.78/1,328.74
  6. Step 6: Final answer
    x = 676.79

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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.