Home / 20,831.07-28,747.32-11,399.64

Finding the Fourth Proportional to 20,831.07, 28,747.32 and 11,399.64

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Solution

The fourth proportional to 20,831.07, 28,747.32 and 11,399.64 is: 15,731.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.07 : 28,747.32 = 11,399.64 : x
  2. Step 2: Convert to fraction form
    20,831.07/28,747.32 = 11,399.64/x
  3. Step 3: Cross multiply
    20,831.07x = 28,747.32 × 11,399.64
  4. Step 4: Simplify right side
    20,831.07x = 327,709,098.96
  5. Step 5: Solve for x
    x = 327,709,098.96/20,831.07
  6. Step 6: Final answer
    x = 15,731.75

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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.