Home / 21,021.54-31,512.87-7,882.53

Finding the Fourth Proportional to 21,021.54, 31,512.87 and 7,882.53

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Solution

The fourth proportional to 21,021.54, 31,512.87 and 7,882.53 is: 11,816.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,021.54 : 31,512.87 = 7,882.53 : x
  2. Step 2: Convert to fraction form
    21,021.54/31,512.87 = 7,882.53/x
  3. Step 3: Cross multiply
    21,021.54x = 31,512.87 × 7,882.53
  4. Step 4: Simplify right side
    21,021.54x = 248,401,143.16
  5. Step 5: Solve for x
    x = 248,401,143.16/21,021.54
  6. Step 6: Final answer
    x = 11,816.51

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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.