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Finding the Fourth Proportional to 303,661.20, 455,404.72 and 90,420.20

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Solution

The fourth proportional to 303,661.20, 455,404.72 and 90,420.20 is: 135,604.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    303,661.20 : 455,404.72 = 90,420.20 : x
  2. Step 2: Convert to fraction form
    303,661.20/455,404.72 = 90,420.20/x
  3. Step 3: Cross multiply
    303,661.20x = 455,404.72 × 90,420.20
  4. Step 4: Simplify right side
    303,661.20x = 41,177,785,863.34
  5. Step 5: Solve for x
    x = 41,177,785,863.34/303,661.20
  6. Step 6: Final answer
    x = 135,604.37

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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.