Home / 20,831.16-28,713.24-12,855.90

Finding the Fourth Proportional to 20,831.16, 28,713.24 and 12,855.90

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Solution

The fourth proportional to 20,831.16, 28,713.24 and 12,855.90 is: 17,720.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.16 : 28,713.24 = 12,855.90 : x
  2. Step 2: Convert to fraction form
    20,831.16/28,713.24 = 12,855.90/x
  3. Step 3: Cross multiply
    20,831.16x = 28,713.24 × 12,855.90
  4. Step 4: Simplify right side
    20,831.16x = 369,134,542.12
  5. Step 5: Solve for x
    x = 369,134,542.12/20,831.16
  6. Step 6: Final answer
    x = 17,720.31

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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.