Home / 20,878.96-28,811.92-11,447.28

Finding the Fourth Proportional to 20,878.96, 28,811.92 and 11,447.28

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Solution

The fourth proportional to 20,878.96, 28,811.92 and 11,447.28 is: 15,796.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.96 : 28,811.92 = 11,447.28 : x
  2. Step 2: Convert to fraction form
    20,878.96/28,811.92 = 11,447.28/x
  3. Step 3: Cross multiply
    20,878.96x = 28,811.92 × 11,447.28
  4. Step 4: Simplify right side
    20,878.96x = 329,818,115.58
  5. Step 5: Solve for x
    x = 329,818,115.58/20,878.96
  6. Step 6: Final answer
    x = 15,796.67

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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.