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Finding the Fourth Proportional to 338.19, 507.28 and 81.69

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Solution

The fourth proportional to 338.19, 507.28 and 81.69 is: 122.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.19 : 507.28 = 81.69 : x
  2. Step 2: Convert to fraction form
    338.19/507.28 = 81.69/x
  3. Step 3: Cross multiply
    338.19x = 507.28 × 81.69
  4. Step 4: Simplify right side
    338.19x = 41,439.70
  5. Step 5: Solve for x
    x = 41,439.70/338.19
  6. Step 6: Final answer
    x = 122.53

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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.