Home / 20,820.11-28,731.76-11,388.67

Finding the Fourth Proportional to 20,820.11, 28,731.76 and 11,388.67

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Solution

The fourth proportional to 20,820.11, 28,731.76 and 11,388.67 is: 15,716.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.11 : 28,731.76 = 11,388.67 : x
  2. Step 2: Convert to fraction form
    20,820.11/28,731.76 = 11,388.67/x
  3. Step 3: Cross multiply
    20,820.11x = 28,731.76 × 11,388.67
  4. Step 4: Simplify right side
    20,820.11x = 327,216,432.86
  5. Step 5: Solve for x
    x = 327,216,432.86/20,820.11
  6. Step 6: Final answer
    x = 15,716.37

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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.