Home / 20,379.69-28,124.67-11,427.30

Finding the Fourth Proportional to 20,379.69, 28,124.67 and 11,427.30

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Solution

The fourth proportional to 20,379.69, 28,124.67 and 11,427.30 is: 15,770.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.69 : 28,124.67 = 11,427.30 : x
  2. Step 2: Convert to fraction form
    20,379.69/28,124.67 = 11,427.30/x
  3. Step 3: Cross multiply
    20,379.69x = 28,124.67 × 11,427.30
  4. Step 4: Simplify right side
    20,379.69x = 321,389,041.49
  5. Step 5: Solve for x
    x = 321,389,041.49/20,379.69
  6. Step 6: Final answer
    x = 15,770.07

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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.