Home / 20,831.40-28,747.80-11,400.12

Finding the Fourth Proportional to 20,831.40, 28,747.80 and 11,400.12

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Solution

The fourth proportional to 20,831.40, 28,747.80 and 11,400.12 is: 15,732.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.40 : 28,747.80 = 11,400.12 : x
  2. Step 2: Convert to fraction form
    20,831.40/28,747.80 = 11,400.12/x
  3. Step 3: Cross multiply
    20,831.40x = 28,747.80 × 11,400.12
  4. Step 4: Simplify right side
    20,831.40x = 327,728,369.74
  5. Step 5: Solve for x
    x = 327,728,369.74/20,831.40
  6. Step 6: Final answer
    x = 15,732.42

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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.