Home / 20,781.56-28,680.09-11,831.96

Finding the Fourth Proportional to 20,781.56, 28,680.09 and 11,831.96

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Solution

The fourth proportional to 20,781.56, 28,680.09 and 11,831.96 is: 16,328.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.56 : 28,680.09 = 11,831.96 : x
  2. Step 2: Convert to fraction form
    20,781.56/28,680.09 = 11,831.96/x
  3. Step 3: Cross multiply
    20,781.56x = 28,680.09 × 11,831.96
  4. Step 4: Simplify right side
    20,781.56x = 339,341,677.68
  5. Step 5: Solve for x
    x = 339,341,677.68/20,781.56
  6. Step 6: Final answer
    x = 16,328.98

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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.