Home / 20,389.86-28,138.11-11,897.94

Finding the Fourth Proportional to 20,389.86, 28,138.11 and 11,897.94

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Solution

The fourth proportional to 20,389.86, 28,138.11 and 11,897.94 is: 16,419.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.86 : 28,138.11 = 11,897.94 : x
  2. Step 2: Convert to fraction form
    20,389.86/28,138.11 = 11,897.94/x
  3. Step 3: Cross multiply
    20,389.86x = 28,138.11 × 11,897.94
  4. Step 4: Simplify right side
    20,389.86x = 334,785,544.49
  5. Step 5: Solve for x
    x = 334,785,544.49/20,389.86
  6. Step 6: Final answer
    x = 16,419.22

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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.