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Finding the Fourth Proportional to 338.36, 507.14 and 121.69

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Solution

The fourth proportional to 338.36, 507.14 and 121.69 is: 182.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.36 : 507.14 = 121.69 : x
  2. Step 2: Convert to fraction form
    338.36/507.14 = 121.69/x
  3. Step 3: Cross multiply
    338.36x = 507.14 × 121.69
  4. Step 4: Simplify right side
    338.36x = 61,710.72
  5. Step 5: Solve for x
    x = 61,710.72/338.36
  6. Step 6: Final answer
    x = 182.38

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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.