Home / 21,006.89-31,519.60-11,143.75

Finding the Fourth Proportional to 21,006.89, 31,519.60 and 11,143.75

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Solution

The fourth proportional to 21,006.89, 31,519.60 and 11,143.75 is: 16,720.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.89 : 31,519.60 = 11,143.75 : x
  2. Step 2: Convert to fraction form
    21,006.89/31,519.60 = 11,143.75/x
  3. Step 3: Cross multiply
    21,006.89x = 31,519.60 × 11,143.75
  4. Step 4: Simplify right side
    21,006.89x = 351,246,542.50
  5. Step 5: Solve for x
    x = 351,246,542.50/21,006.89
  6. Step 6: Final answer
    x = 16,720.54

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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.