Home / 2,979.85-4,109.36-2,171.57

Finding the Fourth Proportional to 2,979.85, 4,109.36 and 2,171.57

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Solution

The fourth proportional to 2,979.85, 4,109.36 and 2,171.57 is: 2,994.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,979.85 : 4,109.36 = 2,171.57 : x
  2. Step 2: Convert to fraction form
    2,979.85/4,109.36 = 2,171.57/x
  3. Step 3: Cross multiply
    2,979.85x = 4,109.36 × 2,171.57
  4. Step 4: Simplify right side
    2,979.85x = 8,923,762.90
  5. Step 5: Solve for x
    x = 8,923,762.90/2,979.85
  6. Step 6: Final answer
    x = 2,994.70

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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.