Home / 20,670.12-30,991.82-8,831.60

Finding the Fourth Proportional to 20,670.12, 30,991.82 and 8,831.60

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Solution

The fourth proportional to 20,670.12, 30,991.82 and 8,831.60 is: 13,241.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,670.12 : 30,991.82 = 8,831.60 : x
  2. Step 2: Convert to fraction form
    20,670.12/30,991.82 = 8,831.60/x
  3. Step 3: Cross multiply
    20,670.12x = 30,991.82 × 8,831.60
  4. Step 4: Simplify right side
    20,670.12x = 273,707,357.51
  5. Step 5: Solve for x
    x = 273,707,357.51/20,670.12
  6. Step 6: Final answer
    x = 13,241.69

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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.