Home / 428,000.20-642,000.30-303,584.20

Finding the Fourth Proportional to 428,000.20, 642,000.30 and 303,584.20

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Solution

The fourth proportional to 428,000.20, 642,000.30 and 303,584.20 is: 455,376.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,000.20 : 642,000.30 = 303,584.20 : x
  2. Step 2: Convert to fraction form
    428,000.20/642,000.30 = 303,584.20/x
  3. Step 3: Cross multiply
    428,000.20x = 642,000.30 × 303,584.20
  4. Step 4: Simplify right side
    428,000.20x = 194,901,147,475.26
  5. Step 5: Solve for x
    x = 194,901,147,475.26/428,000.20
  6. Step 6: Final answer
    x = 455,376.30

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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.