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Finding the Fourth Proportional to 800.62, 1,200.55 and 338.15

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Solution

The fourth proportional to 800.62, 1,200.55 and 338.15 is: 507.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.62 : 1,200.55 = 338.15 : x
  2. Step 2: Convert to fraction form
    800.62/1,200.55 = 338.15/x
  3. Step 3: Cross multiply
    800.62x = 1,200.55 × 338.15
  4. Step 4: Simplify right side
    800.62x = 405,965.98
  5. Step 5: Solve for x
    x = 405,965.98/800.62
  6. Step 6: Final answer
    x = 507.06

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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.