Home / 21,028.50-31,542.75-8,555.31

Finding the Fourth Proportional to 21,028.50, 31,542.75 and 8,555.31

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Solution

The fourth proportional to 21,028.50, 31,542.75 and 8,555.31 is: 12,832.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,028.50 : 31,542.75 = 8,555.31 : x
  2. Step 2: Convert to fraction form
    21,028.50/31,542.75 = 8,555.31/x
  3. Step 3: Cross multiply
    21,028.50x = 31,542.75 × 8,555.31
  4. Step 4: Simplify right side
    21,028.50x = 269,858,004.50
  5. Step 5: Solve for x
    x = 269,858,004.50/21,028.50
  6. Step 6: Final answer
    x = 12,832.97

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Double scale
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1.5x scale

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.