Home / 428,087.20-591,157.44-320,470.40

Finding the Fourth Proportional to 428,087.20, 591,157.44 and 320,470.40

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Solution

The fourth proportional to 428,087.20, 591,157.44 and 320,470.40 is: 442,546.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,087.20 : 591,157.44 = 320,470.40 : x
  2. Step 2: Convert to fraction form
    428,087.20/591,157.44 = 320,470.40/x
  3. Step 3: Cross multiply
    428,087.20x = 591,157.44 × 320,470.40
  4. Step 4: Simplify right side
    428,087.20x = 189,448,461,259.78
  5. Step 5: Solve for x
    x = 189,448,461,259.78/428,087.20
  6. Step 6: Final answer
    x = 442,546.43

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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.