Home / 20,947.12-28,907.04-11,515.84

Finding the Fourth Proportional to 20,947.12, 28,907.04 and 11,515.84

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Solution

The fourth proportional to 20,947.12, 28,907.04 and 11,515.84 is: 15,891.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,947.12 : 28,907.04 = 11,515.84 : x
  2. Step 2: Convert to fraction form
    20,947.12/28,907.04 = 11,515.84/x
  3. Step 3: Cross multiply
    20,947.12x = 28,907.04 × 11,515.84
  4. Step 4: Simplify right side
    20,947.12x = 332,888,847.51
  5. Step 5: Solve for x
    x = 332,888,847.51/20,947.12
  6. Step 6: Final answer
    x = 15,891.87

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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.