Home / 20,373.21-28,115.79-11,420.88

Finding the Fourth Proportional to 20,373.21, 28,115.79 and 11,420.88

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Solution

The fourth proportional to 20,373.21, 28,115.79 and 11,420.88 is: 15,761.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,373.21 : 28,115.79 = 11,420.88 : x
  2. Step 2: Convert to fraction form
    20,373.21/28,115.79 = 11,420.88/x
  3. Step 3: Cross multiply
    20,373.21x = 28,115.79 × 11,420.88
  4. Step 4: Simplify right side
    20,373.21x = 321,107,063.70
  5. Step 5: Solve for x
    x = 321,107,063.70/20,373.21
  6. Step 6: Final answer
    x = 15,761.24

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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.