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Finding the Fourth Proportional to 20,191.40, 30,250.65 and 18,879.20

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Solution

The fourth proportional to 20,191.40, 30,250.65 and 18,879.20 is: 28,284.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,191.40 : 30,250.65 = 18,879.20 : x
  2. Step 2: Convert to fraction form
    20,191.40/30,250.65 = 18,879.20/x
  3. Step 3: Cross multiply
    20,191.40x = 30,250.65 × 18,879.20
  4. Step 4: Simplify right side
    20,191.40x = 571,108,071.48
  5. Step 5: Solve for x
    x = 571,108,071.48/20,191.40
  6. Step 6: Final answer
    x = 28,284.72

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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.