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Finding the Fourth Proportional to 2,091.07, 3,135.53 and 920.57

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Solution

The fourth proportional to 2,091.07, 3,135.53 and 920.57 is: 1,380.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,091.07 : 3,135.53 = 920.57 : x
  2. Step 2: Convert to fraction form
    2,091.07/3,135.53 = 920.57/x
  3. Step 3: Cross multiply
    2,091.07x = 3,135.53 × 920.57
  4. Step 4: Simplify right side
    2,091.07x = 2,886,456.30
  5. Step 5: Solve for x
    x = 2,886,456.30/2,091.07
  6. Step 6: Final answer
    x = 1,380.38

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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.