Home / 20,720.20-31,080.30-18,905.80

Finding the Fourth Proportional to 20,720.20, 31,080.30 and 18,905.80

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Solution

The fourth proportional to 20,720.20, 31,080.30 and 18,905.80 is: 28,358.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.20 : 31,080.30 = 18,905.80 : x
  2. Step 2: Convert to fraction form
    20,720.20/31,080.30 = 18,905.80/x
  3. Step 3: Cross multiply
    20,720.20x = 31,080.30 × 18,905.80
  4. Step 4: Simplify right side
    20,720.20x = 587,597,935.74
  5. Step 5: Solve for x
    x = 587,597,935.74/20,720.20
  6. Step 6: Final answer
    x = 28,358.70

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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.