Home / 20,139.40-30,209.10-19,847.80

Finding the Fourth Proportional to 20,139.40, 30,209.10 and 19,847.80

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Solution

The fourth proportional to 20,139.40, 30,209.10 and 19,847.80 is: 29,771.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.40 : 30,209.10 = 19,847.80 : x
  2. Step 2: Convert to fraction form
    20,139.40/30,209.10 = 19,847.80/x
  3. Step 3: Cross multiply
    20,139.40x = 30,209.10 × 19,847.80
  4. Step 4: Simplify right side
    20,139.40x = 599,584,174.98
  5. Step 5: Solve for x
    x = 599,584,174.98/20,139.40
  6. Step 6: Final answer
    x = 29,771.70

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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.