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Finding the Fourth Proportional to 338.66, 507.86 and 133.11

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Solution

The fourth proportional to 338.66, 507.86 and 133.11 is: 199.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.66 : 507.86 = 133.11 : x
  2. Step 2: Convert to fraction form
    338.66/507.86 = 133.11/x
  3. Step 3: Cross multiply
    338.66x = 507.86 × 133.11
  4. Step 4: Simplify right side
    338.66x = 67,601.24
  5. Step 5: Solve for x
    x = 67,601.24/338.66
  6. Step 6: Final answer
    x = 199.61

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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.