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Finding the Fourth Proportional to 408,315.20, 612,429.60 and 127,817.60

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Solution

The fourth proportional to 408,315.20, 612,429.60 and 127,817.60 is: 191,712.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,315.20 : 612,429.60 = 127,817.60 : x
  2. Step 2: Convert to fraction form
    408,315.20/612,429.60 = 127,817.60/x
  3. Step 3: Cross multiply
    408,315.20x = 612,429.60 × 127,817.60
  4. Step 4: Simplify right side
    408,315.20x = 78,279,281,640.96
  5. Step 5: Solve for x
    x = 78,279,281,640.96/408,315.20
  6. Step 6: Final answer
    x = 191,712.88

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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.