Home / 426,234.20-639,869.70-320,221.40

Finding the Fourth Proportional to 426,234.20, 639,869.70 and 320,221.40

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Solution

The fourth proportional to 426,234.20, 639,869.70 and 320,221.40 is: 480,721.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,234.20 : 639,869.70 = 320,221.40 : x
  2. Step 2: Convert to fraction form
    426,234.20/639,869.70 = 320,221.40/x
  3. Step 3: Cross multiply
    426,234.20x = 639,869.70 × 320,221.40
  4. Step 4: Simplify right side
    426,234.20x = 204,899,971,151.58
  5. Step 5: Solve for x
    x = 204,899,971,151.58/426,234.20
  6. Step 6: Final answer
    x = 480,721.56

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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.