Home / 20,786.40-28,693.44-12,831.84

Finding the Fourth Proportional to 20,786.40, 28,693.44 and 12,831.84

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Solution

The fourth proportional to 20,786.40, 28,693.44 and 12,831.84 is: 17,713.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.40 : 28,693.44 = 12,831.84 : x
  2. Step 2: Convert to fraction form
    20,786.40/28,693.44 = 12,831.84/x
  3. Step 3: Cross multiply
    20,786.40x = 28,693.44 × 12,831.84
  4. Step 4: Simplify right side
    20,786.40x = 368,189,631.13
  5. Step 5: Solve for x
    x = 368,189,631.13/20,786.40
  6. Step 6: Final answer
    x = 17,713.01

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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.