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Finding the Fourth Proportional to 289,874.40, 434,617.20 and 132,021.60

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Solution

The fourth proportional to 289,874.40, 434,617.20 and 132,021.60 is: 197,943.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,874.40 : 434,617.20 = 132,021.60 : x
  2. Step 2: Convert to fraction form
    289,874.40/434,617.20 = 132,021.60/x
  3. Step 3: Cross multiply
    289,874.40x = 434,617.20 × 132,021.60
  4. Step 4: Simplify right side
    289,874.40x = 57,378,858,131.52
  5. Step 5: Solve for x
    x = 57,378,858,131.52/289,874.40
  6. Step 6: Final answer
    x = 197,943.86

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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.