Home / 428,327.20-642,490.80-303,911.20

Finding the Fourth Proportional to 428,327.20, 642,490.80 and 303,911.20

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Solution

The fourth proportional to 428,327.20, 642,490.80 and 303,911.20 is: 455,866.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,327.20 : 642,490.80 = 303,911.20 : x
  2. Step 2: Convert to fraction form
    428,327.20/642,490.80 = 303,911.20/x
  3. Step 3: Cross multiply
    428,327.20x = 642,490.80 × 303,911.20
  4. Step 4: Simplify right side
    428,327.20x = 195,260,150,016.96
  5. Step 5: Solve for x
    x = 195,260,150,016.96/428,327.20
  6. Step 6: Final answer
    x = 455,866.80

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Similar ratio
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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.