Home / 428,086.20-591,156.06-320,469.40

Finding the Fourth Proportional to 428,086.20, 591,156.06 and 320,469.40

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Solution

The fourth proportional to 428,086.20, 591,156.06 and 320,469.40 is: 442,545.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,086.20 : 591,156.06 = 320,469.40 : x
  2. Step 2: Convert to fraction form
    428,086.20/591,156.06 = 320,469.40/x
  3. Step 3: Cross multiply
    428,086.20x = 591,156.06 × 320,469.40
  4. Step 4: Simplify right side
    428,086.20x = 189,447,427,854.56
  5. Step 5: Solve for x
    x = 189,447,427,854.56/428,086.20
  6. Step 6: Final answer
    x = 442,545.05

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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.