Home / 20,947.20-28,904.76-11,515.20

Finding the Fourth Proportional to 20,947.20, 28,904.76 and 11,515.20

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Solution

The fourth proportional to 20,947.20, 28,904.76 and 11,515.20 is: 15,889.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,947.20 : 28,904.76 = 11,515.20 : x
  2. Step 2: Convert to fraction form
    20,947.20/28,904.76 = 11,515.20/x
  3. Step 3: Cross multiply
    20,947.20x = 28,904.76 × 11,515.20
  4. Step 4: Simplify right side
    20,947.20x = 332,844,092.35
  5. Step 5: Solve for x
    x = 332,844,092.35/20,947.20
  6. Step 6: Final answer
    x = 15,889.67

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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.