Home / 20,755.92-31,131.58-7,428.38

Finding the Fourth Proportional to 20,755.92, 31,131.58 and 7,428.38

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Solution

The fourth proportional to 20,755.92, 31,131.58 and 7,428.38 is: 11,141.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,755.92 : 31,131.58 = 7,428.38 : x
  2. Step 2: Convert to fraction form
    20,755.92/31,131.58 = 7,428.38/x
  3. Step 3: Cross multiply
    20,755.92x = 31,131.58 × 7,428.38
  4. Step 4: Simplify right side
    20,755.92x = 231,257,265.50
  5. Step 5: Solve for x
    x = 231,257,265.50/20,755.92
  6. Step 6: Final answer
    x = 11,141.75

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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.