Home / 18,211.68-27,312.12-7,821

Finding the Fourth Proportional to 18,211.68, 27,312.12 and 7,821

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Solution

The fourth proportional to 18,211.68, 27,312.12 and 7,821 is: 11,729.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,211.68 : 27,312.12 = 7,821 : x
  2. Step 2: Convert to fraction form
    18,211.68/27,312.12 = 7,821/x
  3. Step 3: Cross multiply
    18,211.68x = 27,312.12 × 7,821
  4. Step 4: Simplify right side
    18,211.68x = 213,608,090.52
  5. Step 5: Solve for x
    x = 213,608,090.52/18,211.68
  6. Step 6: Final answer
    x = 11,729.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.