Home / 3,905.85-5,390.16-2,137.45

Finding the Fourth Proportional to 3,905.85, 5,390.16 and 2,137.45

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Solution

The fourth proportional to 3,905.85, 5,390.16 and 2,137.45 is: 2,949.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.85 : 5,390.16 = 2,137.45 : x
  2. Step 2: Convert to fraction form
    3,905.85/5,390.16 = 2,137.45/x
  3. Step 3: Cross multiply
    3,905.85x = 5,390.16 × 2,137.45
  4. Step 4: Simplify right side
    3,905.85x = 11,521,186.80
  5. Step 5: Solve for x
    x = 11,521,186.80/3,905.85
  6. Step 6: Final answer
    x = 2,949.73

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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.