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Finding the Fourth Proportional to 745.93, 1,028.55 and 640.90

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Solution

The fourth proportional to 745.93, 1,028.55 and 640.90 is: 883.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.93 : 1,028.55 = 640.90 : x
  2. Step 2: Convert to fraction form
    745.93/1,028.55 = 640.90/x
  3. Step 3: Cross multiply
    745.93x = 1,028.55 × 640.90
  4. Step 4: Simplify right side
    745.93x = 659,197.70
  5. Step 5: Solve for x
    x = 659,197.70/745.93
  6. Step 6: Final answer
    x = 883.73

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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.