Home / 20,872.54-28,805.28-12,379.69

Finding the Fourth Proportional to 20,872.54, 28,805.28 and 12,379.69

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Solution

The fourth proportional to 20,872.54, 28,805.28 and 12,379.69 is: 17,084.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.54 : 28,805.28 = 12,379.69 : x
  2. Step 2: Convert to fraction form
    20,872.54/28,805.28 = 12,379.69/x
  3. Step 3: Cross multiply
    20,872.54x = 28,805.28 × 12,379.69
  4. Step 4: Simplify right side
    20,872.54x = 356,600,436.76
  5. Step 5: Solve for x
    x = 356,600,436.76/20,872.54
  6. Step 6: Final answer
    x = 17,084.67

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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.