Home / 20,389.96-28,135.88-11,435.60

Finding the Fourth Proportional to 20,389.96, 28,135.88 and 11,435.60

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Solution

The fourth proportional to 20,389.96, 28,135.88 and 11,435.60 is: 15,779.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.96 : 28,135.88 = 11,435.60 : x
  2. Step 2: Convert to fraction form
    20,389.96/28,135.88 = 11,435.60/x
  3. Step 3: Cross multiply
    20,389.96x = 28,135.88 × 11,435.60
  4. Step 4: Simplify right side
    20,389.96x = 321,750,669.33
  5. Step 5: Solve for x
    x = 321,750,669.33/20,389.96
  6. Step 6: Final answer
    x = 15,779.86

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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.