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Finding the Fourth Proportional to 3,418.93, 5,128.60 and 920.49

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Solution

The fourth proportional to 3,418.93, 5,128.60 and 920.49 is: 1,380.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,418.93 : 5,128.60 = 920.49 : x
  2. Step 2: Convert to fraction form
    3,418.93/5,128.60 = 920.49/x
  3. Step 3: Cross multiply
    3,418.93x = 5,128.60 × 920.49
  4. Step 4: Simplify right side
    3,418.93x = 4,720,825.01
  5. Step 5: Solve for x
    x = 4,720,825.01/3,418.93
  6. Step 6: Final answer
    x = 1,380.79

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1.5x scale

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.