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Finding the Fourth Proportional to 20,103.80, 30,155.70 and 14,919.80

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Solution

The fourth proportional to 20,103.80, 30,155.70 and 14,919.80 is: 22,379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,103.80 : 30,155.70 = 14,919.80 : x
  2. Step 2: Convert to fraction form
    20,103.80/30,155.70 = 14,919.80/x
  3. Step 3: Cross multiply
    20,103.80x = 30,155.70 × 14,919.80
  4. Step 4: Simplify right side
    20,103.80x = 449,917,012.86
  5. Step 5: Solve for x
    x = 449,917,012.86/20,103.80
  6. Step 6: Final answer
    x = 22,379.70

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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.