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Finding the Fourth Proportional to 20,879.04, 31,319.48 and 6,839.88

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Solution

The fourth proportional to 20,879.04, 31,319.48 and 6,839.88 is: 10,260.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.04 : 31,319.48 = 6,839.88 : x
  2. Step 2: Convert to fraction form
    20,879.04/31,319.48 = 6,839.88/x
  3. Step 3: Cross multiply
    20,879.04x = 31,319.48 × 6,839.88
  4. Step 4: Simplify right side
    20,879.04x = 214,221,484.86
  5. Step 5: Solve for x
    x = 214,221,484.86/20,879.04
  6. Step 6: Final answer
    x = 10,260.12

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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.