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Finding the Fourth Proportional to 309,945.20, 464,917.80 and 85,305.20

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Solution

The fourth proportional to 309,945.20, 464,917.80 and 85,305.20 is: 127,957.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,945.20 : 464,917.80 = 85,305.20 : x
  2. Step 2: Convert to fraction form
    309,945.20/464,917.80 = 85,305.20/x
  3. Step 3: Cross multiply
    309,945.20x = 464,917.80 × 85,305.20
  4. Step 4: Simplify right side
    309,945.20x = 39,659,905,912.56
  5. Step 5: Solve for x
    x = 39,659,905,912.56/309,945.20
  6. Step 6: Final answer
    x = 127,957.80

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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.