Home / 20,939.85-31,172.31-20,828.97

Finding the Fourth Proportional to 20,939.85, 31,172.31 and 20,828.97

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Solution

The fourth proportional to 20,939.85, 31,172.31 and 20,828.97 is: 31,007.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.85 : 31,172.31 = 20,828.97 : x
  2. Step 2: Convert to fraction form
    20,939.85/31,172.31 = 20,828.97/x
  3. Step 3: Cross multiply
    20,939.85x = 31,172.31 × 20,828.97
  4. Step 4: Simplify right side
    20,939.85x = 649,287,109.82
  5. Step 5: Solve for x
    x = 649,287,109.82/20,939.85
  6. Step 6: Final answer
    x = 31,007.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.