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Finding the Fourth Proportional to 420.40, 629.80 and 237.24

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Solution

The fourth proportional to 420.40, 629.80 and 237.24 is: 355.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.40 : 629.80 = 237.24 : x
  2. Step 2: Convert to fraction form
    420.40/629.80 = 237.24/x
  3. Step 3: Cross multiply
    420.40x = 629.80 × 237.24
  4. Step 4: Simplify right side
    420.40x = 149,413.75
  5. Step 5: Solve for x
    x = 149,413.75/420.40
  6. Step 6: Final answer
    x = 355.41

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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.