Home / 20,779.38-28,677.62-12,395.88

Finding the Fourth Proportional to 20,779.38, 28,677.62 and 12,395.88

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Solution

The fourth proportional to 20,779.38, 28,677.62 and 12,395.88 is: 17,107.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.38 : 28,677.62 = 12,395.88 : x
  2. Step 2: Convert to fraction form
    20,779.38/28,677.62 = 12,395.88/x
  3. Step 3: Cross multiply
    20,779.38x = 28,677.62 × 12,395.88
  4. Step 4: Simplify right side
    20,779.38x = 355,484,336.21
  5. Step 5: Solve for x
    x = 355,484,336.21/20,779.38
  6. Step 6: Final answer
    x = 17,107.55

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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.