Home / 428,086.70-591,156.75-320,469.90

Finding the Fourth Proportional to 428,086.70, 591,156.75 and 320,469.90

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Solution

The fourth proportional to 428,086.70, 591,156.75 and 320,469.90 is: 442,545.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,086.70 : 591,156.75 = 320,469.90 : x
  2. Step 2: Convert to fraction form
    428,086.70/591,156.75 = 320,469.90/x
  3. Step 3: Cross multiply
    428,086.70x = 591,156.75 × 320,469.90
  4. Step 4: Simplify right side
    428,086.70x = 189,447,944,556.83
  5. Step 5: Solve for x
    x = 189,447,944,556.83/428,086.70
  6. Step 6: Final answer
    x = 442,545.74

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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.