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Finding the Fourth Proportional to 3,320.20, 4,979.55 and 979.70

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Solution

The fourth proportional to 3,320.20, 4,979.55 and 979.70 is: 1,469.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.20 : 4,979.55 = 979.70 : x
  2. Step 2: Convert to fraction form
    3,320.20/4,979.55 = 979.70/x
  3. Step 3: Cross multiply
    3,320.20x = 4,979.55 × 979.70
  4. Step 4: Simplify right side
    3,320.20x = 4,878,465.14
  5. Step 5: Solve for x
    x = 4,878,465.14/3,320.20
  6. Step 6: Final answer
    x = 1,469.33

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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.