Home / 20,090.40-30,142.88-12,209.04

Finding the Fourth Proportional to 20,090.40, 30,142.88 and 12,209.04

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Solution

The fourth proportional to 20,090.40, 30,142.88 and 12,209.04 is: 18,317.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,090.40 : 30,142.88 = 12,209.04 : x
  2. Step 2: Convert to fraction form
    20,090.40/30,142.88 = 12,209.04/x
  3. Step 3: Cross multiply
    20,090.40x = 30,142.88 × 12,209.04
  4. Step 4: Simplify right side
    20,090.40x = 368,015,627.64
  5. Step 5: Solve for x
    x = 368,015,627.64/20,090.40
  6. Step 6: Final answer
    x = 18,317.98

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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.