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Finding the Fourth Proportional to 280,940.40, 421,324.20 and 81,279.60

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Solution

The fourth proportional to 280,940.40, 421,324.20 and 81,279.60 is: 121,894.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,940.40 : 421,324.20 = 81,279.60 : x
  2. Step 2: Convert to fraction form
    280,940.40/421,324.20 = 81,279.60/x
  3. Step 3: Cross multiply
    280,940.40x = 421,324.20 × 81,279.60
  4. Step 4: Simplify right side
    280,940.40x = 34,245,062,446.32
  5. Step 5: Solve for x
    x = 34,245,062,446.32/280,940.40
  6. Step 6: Final answer
    x = 121,894.40

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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.