Home / 3,924.11-5,415.35-2,155.78

Finding the Fourth Proportional to 3,924.11, 5,415.35 and 2,155.78

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Solution

The fourth proportional to 3,924.11, 5,415.35 and 2,155.78 is: 2,975.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,924.11 : 5,415.35 = 2,155.78 : x
  2. Step 2: Convert to fraction form
    3,924.11/5,415.35 = 2,155.78/x
  3. Step 3: Cross multiply
    3,924.11x = 5,415.35 × 2,155.78
  4. Step 4: Simplify right side
    3,924.11x = 11,674,303.22
  5. Step 5: Solve for x
    x = 11,674,303.22/3,924.11
  6. Step 6: Final answer
    x = 2,975.02

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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.