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Finding the Fourth Proportional to 338.38, 507.40 and 155.68

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Solution

The fourth proportional to 338.38, 507.40 and 155.68 is: 233.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.38 : 507.40 = 155.68 : x
  2. Step 2: Convert to fraction form
    338.38/507.40 = 155.68/x
  3. Step 3: Cross multiply
    338.38x = 507.40 × 155.68
  4. Step 4: Simplify right side
    338.38x = 78,990.37
  5. Step 5: Solve for x
    x = 78,990.37/338.38
  6. Step 6: Final answer
    x = 233.44

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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.