Home / 20,778.06-28,687.47-12,831.96

Finding the Fourth Proportional to 20,778.06, 28,687.47 and 12,831.96

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Solution

The fourth proportional to 20,778.06, 28,687.47 and 12,831.96 is: 17,716.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.06 : 28,687.47 = 12,831.96 : x
  2. Step 2: Convert to fraction form
    20,778.06/28,687.47 = 12,831.96/x
  3. Step 3: Cross multiply
    20,778.06x = 28,687.47 × 12,831.96
  4. Step 4: Simplify right side
    20,778.06x = 368,116,467.54
  5. Step 5: Solve for x
    x = 368,116,467.54/20,778.06
  6. Step 6: Final answer
    x = 17,716.59

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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.