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Finding the Fourth Proportional to 20,783.59, 28,681.39 and 11,831.09

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Solution

The fourth proportional to 20,783.59, 28,681.39 and 11,831.09 is: 16,326.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.59 : 28,681.39 = 11,831.09 : x
  2. Step 2: Convert to fraction form
    20,783.59/28,681.39 = 11,831.09/x
  3. Step 3: Cross multiply
    20,783.59x = 28,681.39 × 11,831.09
  4. Step 4: Simplify right side
    20,783.59x = 339,332,148.54
  5. Step 5: Solve for x
    x = 339,332,148.54/20,783.59
  6. Step 6: Final answer
    x = 16,326.93

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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.