Home / 21,021.24-31,505.20-20,798.78

Finding the Fourth Proportional to 21,021.24, 31,505.20 and 20,798.78

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Solution

The fourth proportional to 21,021.24, 31,505.20 and 20,798.78 is: 31,171.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,021.24 : 31,505.20 = 20,798.78 : x
  2. Step 2: Convert to fraction form
    21,021.24/31,505.20 = 20,798.78/x
  3. Step 3: Cross multiply
    21,021.24x = 31,505.20 × 20,798.78
  4. Step 4: Simplify right side
    21,021.24x = 655,269,462.14
  5. Step 5: Solve for x
    x = 655,269,462.14/21,021.24
  6. Step 6: Final answer
    x = 31,171.78

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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.