Home / 428,090.20-591,161.58-320,473.40

Finding the Fourth Proportional to 428,090.20, 591,161.58 and 320,473.40

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Solution

The fourth proportional to 428,090.20, 591,161.58 and 320,473.40 is: 442,550.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,090.20 : 591,161.58 = 320,473.40 : x
  2. Step 2: Convert to fraction form
    428,090.20/591,161.58 = 320,473.40/x
  3. Step 3: Cross multiply
    428,090.20x = 591,161.58 × 320,473.40
  4. Step 4: Simplify right side
    428,090.20x = 189,451,561,491.97
  5. Step 5: Solve for x
    x = 189,451,561,491.97/428,090.20
  6. Step 6: Final answer
    x = 442,550.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.