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Finding the Fourth Proportional to 816.49, 1,128.36 and 725.37

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Solution

The fourth proportional to 816.49, 1,128.36 and 725.37 is: 1,002.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.49 : 1,128.36 = 725.37 : x
  2. Step 2: Convert to fraction form
    816.49/1,128.36 = 725.37/x
  3. Step 3: Cross multiply
    816.49x = 1,128.36 × 725.37
  4. Step 4: Simplify right side
    816.49x = 818,478.49
  5. Step 5: Solve for x
    x = 818,478.49/816.49
  6. Step 6: Final answer
    x = 1,002.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.