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Finding the Fourth Proportional to 3,412.97, 4,709.87 and 1,920.90

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Solution

The fourth proportional to 3,412.97, 4,709.87 and 1,920.90 is: 2,650.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,412.97 : 4,709.87 = 1,920.90 : x
  2. Step 2: Convert to fraction form
    3,412.97/4,709.87 = 1,920.90/x
  3. Step 3: Cross multiply
    3,412.97x = 4,709.87 × 1,920.90
  4. Step 4: Simplify right side
    3,412.97x = 9,047,189.28
  5. Step 5: Solve for x
    x = 9,047,189.28/3,412.97
  6. Step 6: Final answer
    x = 2,650.83

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1.5x scale

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.