Home / 20,961.88-28,939.38-13,897.90

Finding the Fourth Proportional to 20,961.88, 28,939.38 and 13,897.90

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Solution

The fourth proportional to 20,961.88, 28,939.38 and 13,897.90 is: 19,187.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.88 : 28,939.38 = 13,897.90 : x
  2. Step 2: Convert to fraction form
    20,961.88/28,939.38 = 13,897.90/x
  3. Step 3: Cross multiply
    20,961.88x = 28,939.38 × 13,897.90
  4. Step 4: Simplify right side
    20,961.88x = 402,196,609.30
  5. Step 5: Solve for x
    x = 402,196,609.30/20,961.88
  6. Step 6: Final answer
    x = 19,187.05

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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.