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Finding the Fourth Proportional to 338.65, 507.87 and 133.17

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Solution

The fourth proportional to 338.65, 507.87 and 133.17 is: 199.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.65 : 507.87 = 133.17 : x
  2. Step 2: Convert to fraction form
    338.65/507.87 = 133.17/x
  3. Step 3: Cross multiply
    338.65x = 507.87 × 133.17
  4. Step 4: Simplify right side
    338.65x = 67,631.14
  5. Step 5: Solve for x
    x = 67,631.14/338.65
  6. Step 6: Final answer
    x = 199.71

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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.