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Finding the Fourth Proportional to 20,187.80, 30,249.30 and 19,021.40

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Solution

The fourth proportional to 20,187.80, 30,249.30 and 19,021.40 is: 28,501.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,187.80 : 30,249.30 = 19,021.40 : x
  2. Step 2: Convert to fraction form
    20,187.80/30,249.30 = 19,021.40/x
  3. Step 3: Cross multiply
    20,187.80x = 30,249.30 × 19,021.40
  4. Step 4: Simplify right side
    20,187.80x = 575,384,035.02
  5. Step 5: Solve for x
    x = 575,384,035.02/20,187.80
  6. Step 6: Final answer
    x = 28,501.57

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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.