Home / 20,268.60-30,420.90-11,938.20

Finding the Fourth Proportional to 20,268.60, 30,420.90 and 11,938.20

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Solution

The fourth proportional to 20,268.60, 30,420.90 and 11,938.20 is: 17,917.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,268.60 : 30,420.90 = 11,938.20 : x
  2. Step 2: Convert to fraction form
    20,268.60/30,420.90 = 11,938.20/x
  3. Step 3: Cross multiply
    20,268.60x = 30,420.90 × 11,938.20
  4. Step 4: Simplify right side
    20,268.60x = 363,170,788.38
  5. Step 5: Solve for x
    x = 363,170,788.38/20,268.60
  6. Step 6: Final answer
    x = 17,917.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.