Home / 3,923.89-5,415.08-2,155.61

Finding the Fourth Proportional to 3,923.89, 5,415.08 and 2,155.61

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Solution

The fourth proportional to 3,923.89, 5,415.08 and 2,155.61 is: 2,974.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,923.89 : 5,415.08 = 2,155.61 : x
  2. Step 2: Convert to fraction form
    3,923.89/5,415.08 = 2,155.61/x
  3. Step 3: Cross multiply
    3,923.89x = 5,415.08 × 2,155.61
  4. Step 4: Simplify right side
    3,923.89x = 11,672,819.53
  5. Step 5: Solve for x
    x = 11,672,819.53/3,923.89
  6. Step 6: Final answer
    x = 2,974.81

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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.