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Finding the Fourth Proportional to 338.28, 507.48 and 121.86

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Solution

The fourth proportional to 338.28, 507.48 and 121.86 is: 182.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.28 : 507.48 = 121.86 : x
  2. Step 2: Convert to fraction form
    338.28/507.48 = 121.86/x
  3. Step 3: Cross multiply
    338.28x = 507.48 × 121.86
  4. Step 4: Simplify right side
    338.28x = 61,841.51
  5. Step 5: Solve for x
    x = 61,841.51/338.28
  6. Step 6: Final answer
    x = 182.81

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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.