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Finding the Fourth Proportional to 420.38, 580.12 and 236.38

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Solution

The fourth proportional to 420.38, 580.12 and 236.38 is: 326.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.38 : 580.12 = 236.38 : x
  2. Step 2: Convert to fraction form
    420.38/580.12 = 236.38/x
  3. Step 3: Cross multiply
    420.38x = 580.12 × 236.38
  4. Step 4: Simplify right side
    420.38x = 137,128.77
  5. Step 5: Solve for x
    x = 137,128.77/420.38
  6. Step 6: Final answer
    x = 326.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.