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Finding the Fourth Proportional to 725.14, 1,085.28 and 450.28

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Solution

The fourth proportional to 725.14, 1,085.28 and 450.28 is: 673.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.14 : 1,085.28 = 450.28 : x
  2. Step 2: Convert to fraction form
    725.14/1,085.28 = 450.28/x
  3. Step 3: Cross multiply
    725.14x = 1,085.28 × 450.28
  4. Step 4: Simplify right side
    725.14x = 488,679.88
  5. Step 5: Solve for x
    x = 488,679.88/725.14
  6. Step 6: Final answer
    x = 673.91

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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.