Home / 20,872.48-28,805.20-12,379.63

Finding the Fourth Proportional to 20,872.48, 28,805.20 and 12,379.63

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Solution

The fourth proportional to 20,872.48, 28,805.20 and 12,379.63 is: 17,084.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.48 : 28,805.20 = 12,379.63 : x
  2. Step 2: Convert to fraction form
    20,872.48/28,805.20 = 12,379.63/x
  3. Step 3: Cross multiply
    20,872.48x = 28,805.20 × 12,379.63
  4. Step 4: Simplify right side
    20,872.48x = 356,597,615.11
  5. Step 5: Solve for x
    x = 356,597,615.11/20,872.48
  6. Step 6: Final answer
    x = 17,084.58

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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.