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Finding the Fourth Proportional to 428,327.70, 642,491.55 and 303,911.70

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Solution

The fourth proportional to 428,327.70, 642,491.55 and 303,911.70 is: 455,867.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,327.70 : 642,491.55 = 303,911.70 : x
  2. Step 2: Convert to fraction form
    428,327.70/642,491.55 = 303,911.70/x
  3. Step 3: Cross multiply
    428,327.70x = 642,491.55 × 303,911.70
  4. Step 4: Simplify right side
    428,327.70x = 195,260,699,196.14
  5. Step 5: Solve for x
    x = 195,260,699,196.14/428,327.70
  6. Step 6: Final answer
    x = 455,867.55

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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.