Home / 3,947.21-5,447.08-2,178.77

Finding the Fourth Proportional to 3,947.21, 5,447.08 and 2,178.77

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Solution

The fourth proportional to 3,947.21, 5,447.08 and 2,178.77 is: 3,006.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947.21 : 5,447.08 = 2,178.77 : x
  2. Step 2: Convert to fraction form
    3,947.21/5,447.08 = 2,178.77/x
  3. Step 3: Cross multiply
    3,947.21x = 5,447.08 × 2,178.77
  4. Step 4: Simplify right side
    3,947.21x = 11,867,901.81
  5. Step 5: Solve for x
    x = 11,867,901.81/3,947.21
  6. Step 6: Final answer
    x = 3,006.66

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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.