Home / 20,779.38-28,668.78-12,281.76

Finding the Fourth Proportional to 20,779.38, 28,668.78 and 12,281.76

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Solution

The fourth proportional to 20,779.38, 28,668.78 and 12,281.76 is: 16,944.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.38 : 28,668.78 = 12,281.76 : x
  2. Step 2: Convert to fraction form
    20,779.38/28,668.78 = 12,281.76/x
  3. Step 3: Cross multiply
    20,779.38x = 28,668.78 × 12,281.76
  4. Step 4: Simplify right side
    20,779.38x = 352,103,075.45
  5. Step 5: Solve for x
    x = 352,103,075.45/20,779.38
  6. Step 6: Final answer
    x = 16,944.83

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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.