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Finding the Fourth Proportional to 800,428.62, 1,200,642.96 and 379,474.86

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Solution

The fourth proportional to 800,428.62, 1,200,642.96 and 379,474.86 is: 569,212.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    800,428.62 : 1,200,642.96 = 379,474.86 : x
  2. Step 2: Convert to fraction form
    800,428.62/1,200,642.96 = 379,474.86/x
  3. Step 3: Cross multiply
    800,428.62x = 1,200,642.96 × 379,474.86
  4. Step 4: Simplify right side
    800,428.62x = 455,613,819,155.99
  5. Step 5: Solve for x
    x = 455,613,819,155.99/800,428.62
  6. Step 6: Final answer
    x = 569,212.30

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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.