Home / 3,939-5,435.88-2,170.77

Finding the Fourth Proportional to 3,939, 5,435.88 and 2,170.77

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Solution

The fourth proportional to 3,939, 5,435.88 and 2,170.77 is: 2,995.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,939 : 5,435.88 = 2,170.77 : x
  2. Step 2: Convert to fraction form
    3,939/5,435.88 = 2,170.77/x
  3. Step 3: Cross multiply
    3,939x = 5,435.88 × 2,170.77
  4. Step 4: Simplify right side
    3,939x = 11,800,045.23
  5. Step 5: Solve for x
    x = 11,800,045.23/3,939
  6. Step 6: Final answer
    x = 2,995.70

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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.