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Finding the Fourth Proportional to 420.66, 629.82 and 237.78

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Solution

The fourth proportional to 420.66, 629.82 and 237.78 is: 356.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.66 : 629.82 = 237.78 : x
  2. Step 2: Convert to fraction form
    420.66/629.82 = 237.78/x
  3. Step 3: Cross multiply
    420.66x = 629.82 × 237.78
  4. Step 4: Simplify right side
    420.66x = 149,758.60
  5. Step 5: Solve for x
    x = 149,758.60/420.66
  6. Step 6: Final answer
    x = 356.01

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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.