Home / 20,775.84-28,676.61-12,279.39

Finding the Fourth Proportional to 20,775.84, 28,676.61 and 12,279.39

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Solution

The fourth proportional to 20,775.84, 28,676.61 and 12,279.39 is: 16,949.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,775.84 : 28,676.61 = 12,279.39 : x
  2. Step 2: Convert to fraction form
    20,775.84/28,676.61 = 12,279.39/x
  3. Step 3: Cross multiply
    20,775.84x = 28,676.61 × 12,279.39
  4. Step 4: Simplify right side
    20,775.84x = 352,131,278.07
  5. Step 5: Solve for x
    x = 352,131,278.07/20,775.84
  6. Step 6: Final answer
    x = 16,949.08

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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.