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Finding the Fourth Proportional to 408,499.20, 612,705.60 and 128,001.60

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Solution

The fourth proportional to 408,499.20, 612,705.60 and 128,001.60 is: 191,988.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,499.20 : 612,705.60 = 128,001.60 : x
  2. Step 2: Convert to fraction form
    408,499.20/612,705.60 = 128,001.60/x
  3. Step 3: Cross multiply
    408,499.20x = 612,705.60 × 128,001.60
  4. Step 4: Simplify right side
    408,499.20x = 78,427,297,128.96
  5. Step 5: Solve for x
    x = 78,427,297,128.96/408,499.20
  6. Step 6: Final answer
    x = 191,988.86

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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.