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Finding the Fourth Proportional to 20,432.40, 30,648.60 and 8,120.40

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Solution

The fourth proportional to 20,432.40, 30,648.60 and 8,120.40 is: 12,180.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,432.40 : 30,648.60 = 8,120.40 : x
  2. Step 2: Convert to fraction form
    20,432.40/30,648.60 = 8,120.40/x
  3. Step 3: Cross multiply
    20,432.40x = 30,648.60 × 8,120.40
  4. Step 4: Simplify right side
    20,432.40x = 248,878,891.44
  5. Step 5: Solve for x
    x = 248,878,891.44/20,432.40
  6. Step 6: Final answer
    x = 12,180.60

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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.