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Finding the Fourth Proportional to 745.01, 1,028.49 and 685.73

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Solution

The fourth proportional to 745.01, 1,028.49 and 685.73 is: 946.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.01 : 1,028.49 = 685.73 : x
  2. Step 2: Convert to fraction form
    745.01/1,028.49 = 685.73/x
  3. Step 3: Cross multiply
    745.01x = 1,028.49 × 685.73
  4. Step 4: Simplify right side
    745.01x = 705,266.45
  5. Step 5: Solve for x
    x = 705,266.45/745.01
  6. Step 6: Final answer
    x = 946.65

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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.