Home / 3,930.12-5,423.56-2,161.72

Finding the Fourth Proportional to 3,930.12, 5,423.56 and 2,161.72

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Solution

The fourth proportional to 3,930.12, 5,423.56 and 2,161.72 is: 2,983.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930.12 : 5,423.56 = 2,161.72 : x
  2. Step 2: Convert to fraction form
    3,930.12/5,423.56 = 2,161.72/x
  3. Step 3: Cross multiply
    3,930.12x = 5,423.56 × 2,161.72
  4. Step 4: Simplify right side
    3,930.12x = 11,724,219.50
  5. Step 5: Solve for x
    x = 11,724,219.50/3,930.12
  6. Step 6: Final answer
    x = 2,983.17

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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.