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Finding the Fourth Proportional to 20,111.40, 30,168.90 and 8,422.20

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Solution

The fourth proportional to 20,111.40, 30,168.90 and 8,422.20 is: 12,634.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,111.40 : 30,168.90 = 8,422.20 : x
  2. Step 2: Convert to fraction form
    20,111.40/30,168.90 = 8,422.20/x
  3. Step 3: Cross multiply
    20,111.40x = 30,168.90 × 8,422.20
  4. Step 4: Simplify right side
    20,111.40x = 254,088,509.58
  5. Step 5: Solve for x
    x = 254,088,509.58/20,111.40
  6. Step 6: Final answer
    x = 12,634.05

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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.