Home / 20,221.76-30,312-12,831.68

Finding the Fourth Proportional to 20,221.76, 30,312 and 12,831.68

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Solution

The fourth proportional to 20,221.76, 30,312 and 12,831.68 is: 19,234.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,221.76 : 30,312 = 12,831.68 : x
  2. Step 2: Convert to fraction form
    20,221.76/30,312 = 12,831.68/x
  3. Step 3: Cross multiply
    20,221.76x = 30,312 × 12,831.68
  4. Step 4: Simplify right side
    20,221.76x = 388,953,884.16
  5. Step 5: Solve for x
    x = 388,953,884.16/20,221.76
  6. Step 6: Final answer
    x = 19,234.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.