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Finding the Fourth Proportional to 420.57, 580.53 and 351.44

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Solution

The fourth proportional to 420.57, 580.53 and 351.44 is: 485.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.57 : 580.53 = 351.44 : x
  2. Step 2: Convert to fraction form
    420.57/580.53 = 351.44/x
  3. Step 3: Cross multiply
    420.57x = 580.53 × 351.44
  4. Step 4: Simplify right side
    420.57x = 204,018.56
  5. Step 5: Solve for x
    x = 204,018.56/420.57
  6. Step 6: Final answer
    x = 485.10

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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.