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Finding the Fourth Proportional to 418,939.20, 628,408.80 and 324,460.80

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Solution

The fourth proportional to 418,939.20, 628,408.80 and 324,460.80 is: 486,691.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,939.20 : 628,408.80 = 324,460.80 : x
  2. Step 2: Convert to fraction form
    418,939.20/628,408.80 = 324,460.80/x
  3. Step 3: Cross multiply
    418,939.20x = 628,408.80 × 324,460.80
  4. Step 4: Simplify right side
    418,939.20x = 203,894,021,975.04
  5. Step 5: Solve for x
    x = 203,894,021,975.04/418,939.20
  6. Step 6: Final answer
    x = 486,691.20

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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.