Home / 20,885.31-28,821.87-11,453.94

Finding the Fourth Proportional to 20,885.31, 28,821.87 and 11,453.94

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Solution

The fourth proportional to 20,885.31, 28,821.87 and 11,453.94 is: 15,806.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.31 : 28,821.87 = 11,453.94 : x
  2. Step 2: Convert to fraction form
    20,885.31/28,821.87 = 11,453.94/x
  3. Step 3: Cross multiply
    20,885.31x = 28,821.87 × 11,453.94
  4. Step 4: Simplify right side
    20,885.31x = 330,123,969.67
  5. Step 5: Solve for x
    x = 330,123,969.67/20,885.31
  6. Step 6: Final answer
    x = 15,806.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.