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Finding the Fourth Proportional to 1,328.75, 1,992.80 and 451.23

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Solution

The fourth proportional to 1,328.75, 1,992.80 and 451.23 is: 676.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.75 : 1,992.80 = 451.23 : x
  2. Step 2: Convert to fraction form
    1,328.75/1,992.80 = 451.23/x
  3. Step 3: Cross multiply
    1,328.75x = 1,992.80 × 451.23
  4. Step 4: Simplify right side
    1,328.75x = 899,211.14
  5. Step 5: Solve for x
    x = 899,211.14/1,328.75
  6. Step 6: Final answer
    x = 676.73

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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.