Home / 20,782.82-28,678.92-11,831.24

Finding the Fourth Proportional to 20,782.82, 28,678.92 and 11,831.24

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Solution

The fourth proportional to 20,782.82, 28,678.92 and 11,831.24 is: 16,326.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,782.82 : 28,678.92 = 11,831.24 : x
  2. Step 2: Convert to fraction form
    20,782.82/28,678.92 = 11,831.24/x
  3. Step 3: Cross multiply
    20,782.82x = 28,678.92 × 11,831.24
  4. Step 4: Simplify right side
    20,782.82x = 339,307,185.46
  5. Step 5: Solve for x
    x = 339,307,185.46/20,782.82
  6. Step 6: Final answer
    x = 16,326.33

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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.