Home / 20,942.40-28,901.76-11,511.68

Finding the Fourth Proportional to 20,942.40, 28,901.76 and 11,511.68

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Solution

The fourth proportional to 20,942.40, 28,901.76 and 11,511.68 is: 15,886.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.40 : 28,901.76 = 11,511.68 : x
  2. Step 2: Convert to fraction form
    20,942.40/28,901.76 = 11,511.68/x
  3. Step 3: Cross multiply
    20,942.40x = 28,901.76 × 11,511.68
  4. Step 4: Simplify right side
    20,942.40x = 332,707,812.56
  5. Step 5: Solve for x
    x = 332,707,812.56/20,942.40
  6. Step 6: Final answer
    x = 15,886.80

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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.