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Finding the Fourth Proportional to 81,414.60, 122,121.90 and 28,829.40

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Solution

The fourth proportional to 81,414.60, 122,121.90 and 28,829.40 is: 43,244.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,414.60 : 122,121.90 = 28,829.40 : x
  2. Step 2: Convert to fraction form
    81,414.60/122,121.90 = 28,829.40/x
  3. Step 3: Cross multiply
    81,414.60x = 122,121.90 × 28,829.40
  4. Step 4: Simplify right side
    81,414.60x = 3,520,701,103.86
  5. Step 5: Solve for x
    x = 3,520,701,103.86/81,414.60
  6. Step 6: Final answer
    x = 43,244.10

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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.