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Finding the Fourth Proportional to 420.72, 629.73 and 237.54

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Solution

The fourth proportional to 420.72, 629.73 and 237.54 is: 355.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.72 : 629.73 = 237.54 : x
  2. Step 2: Convert to fraction form
    420.72/629.73 = 237.54/x
  3. Step 3: Cross multiply
    420.72x = 629.73 × 237.54
  4. Step 4: Simplify right side
    420.72x = 149,586.06
  5. Step 5: Solve for x
    x = 149,586.06/420.72
  6. Step 6: Final answer
    x = 355.55

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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.