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Finding the Fourth Proportional to 338.39, 507.59 and 121.98

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Solution

The fourth proportional to 338.39, 507.59 and 121.98 is: 182.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.39 : 507.59 = 121.98 : x
  2. Step 2: Convert to fraction form
    338.39/507.59 = 121.98/x
  3. Step 3: Cross multiply
    338.39x = 507.59 × 121.98
  4. Step 4: Simplify right side
    338.39x = 61,915.22
  5. Step 5: Solve for x
    x = 61,915.22/338.39
  6. Step 6: Final answer
    x = 182.97

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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.