Home / 20,107.40-30,161.10-12,720.20

Finding the Fourth Proportional to 20,107.40, 30,161.10 and 12,720.20

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Solution

The fourth proportional to 20,107.40, 30,161.10 and 12,720.20 is: 19,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,107.40 : 30,161.10 = 12,720.20 : x
  2. Step 2: Convert to fraction form
    20,107.40/30,161.10 = 12,720.20/x
  3. Step 3: Cross multiply
    20,107.40x = 30,161.10 × 12,720.20
  4. Step 4: Simplify right side
    20,107.40x = 383,655,224.22
  5. Step 5: Solve for x
    x = 383,655,224.22/20,107.40
  6. Step 6: Final answer
    x = 19,080.30

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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.