Home / 20,377.12-28,134.32-13,672.80

Finding the Fourth Proportional to 20,377.12, 28,134.32 and 13,672.80

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Solution

The fourth proportional to 20,377.12, 28,134.32 and 13,672.80 is: 18,877.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,377.12 : 28,134.32 = 13,672.80 : x
  2. Step 2: Convert to fraction form
    20,377.12/28,134.32 = 13,672.80/x
  3. Step 3: Cross multiply
    20,377.12x = 28,134.32 × 13,672.80
  4. Step 4: Simplify right side
    20,377.12x = 384,674,930.50
  5. Step 5: Solve for x
    x = 384,674,930.50/20,377.12
  6. Step 6: Final answer
    x = 18,877.79

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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.