Home / 20,191.90-30,251.40-18,879.70

Finding the Fourth Proportional to 20,191.90, 30,251.40 and 18,879.70

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Solution

The fourth proportional to 20,191.90, 30,251.40 and 18,879.70 is: 28,285.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,191.90 : 30,251.40 = 18,879.70 : x
  2. Step 2: Convert to fraction form
    20,191.90/30,251.40 = 18,879.70/x
  3. Step 3: Cross multiply
    20,191.90x = 30,251.40 × 18,879.70
  4. Step 4: Simplify right side
    20,191.90x = 571,137,356.58
  5. Step 5: Solve for x
    x = 571,137,356.58/20,191.90
  6. Step 6: Final answer
    x = 28,285.47

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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.