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Finding the Fourth Proportional to 13,879.76, 20,820.92 and 4,519.40

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Solution

The fourth proportional to 13,879.76, 20,820.92 and 4,519.40 is: 6,779.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.76 : 20,820.92 = 4,519.40 : x
  2. Step 2: Convert to fraction form
    13,879.76/20,820.92 = 4,519.40/x
  3. Step 3: Cross multiply
    13,879.76x = 20,820.92 × 4,519.40
  4. Step 4: Simplify right side
    13,879.76x = 94,097,939.15
  5. Step 5: Solve for x
    x = 94,097,939.15/13,879.76
  6. Step 6: Final answer
    x = 6,779.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.