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Finding the Fourth Proportional to 3,320.78, 4,979.73 and 1,128.92

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Solution

The fourth proportional to 3,320.78, 4,979.73 and 1,128.92 is: 1,692.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.78 : 4,979.73 = 1,128.92 : x
  2. Step 2: Convert to fraction form
    3,320.78/4,979.73 = 1,128.92/x
  3. Step 3: Cross multiply
    3,320.78x = 4,979.73 × 1,128.92
  4. Step 4: Simplify right side
    3,320.78x = 5,621,716.79
  5. Step 5: Solve for x
    x = 5,621,716.79/3,320.78
  6. Step 6: Final answer
    x = 1,692.89

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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.