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Finding the Fourth Proportional to 1,205, 1,805.97 and 511.33

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Solution

The fourth proportional to 1,205, 1,805.97 and 511.33 is: 766.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205 : 1,805.97 = 511.33 : x
  2. Step 2: Convert to fraction form
    1,205/1,805.97 = 511.33/x
  3. Step 3: Cross multiply
    1,205x = 1,805.97 × 511.33
  4. Step 4: Simplify right side
    1,205x = 923,437.61
  5. Step 5: Solve for x
    x = 923,437.61/1,205
  6. Step 6: Final answer
    x = 766.34

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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.