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Finding the Fourth Proportional to 338.58, 507.94 and 133.18

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Solution

The fourth proportional to 338.58, 507.94 and 133.18 is: 199.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.58 : 507.94 = 133.18 : x
  2. Step 2: Convert to fraction form
    338.58/507.94 = 133.18/x
  3. Step 3: Cross multiply
    338.58x = 507.94 × 133.18
  4. Step 4: Simplify right side
    338.58x = 67,645.85
  5. Step 5: Solve for x
    x = 67,645.85/338.58
  6. Step 6: Final answer
    x = 199.79

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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.