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Finding the Fourth Proportional to 800.66, 1,201.28 and 338.39

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Solution

The fourth proportional to 800.66, 1,201.28 and 338.39 is: 507.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.66 : 1,201.28 = 338.39 : x
  2. Step 2: Convert to fraction form
    800.66/1,201.28 = 338.39/x
  3. Step 3: Cross multiply
    800.66x = 1,201.28 × 338.39
  4. Step 4: Simplify right side
    800.66x = 406,502.45
  5. Step 5: Solve for x
    x = 406,502.45/800.66
  6. Step 6: Final answer
    x = 507.71

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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.