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Finding the Fourth Proportional to 420.33, 629.26 and 312.60

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Solution

The fourth proportional to 420.33, 629.26 and 312.60 is: 467.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.33 : 629.26 = 312.60 : x
  2. Step 2: Convert to fraction form
    420.33/629.26 = 312.60/x
  3. Step 3: Cross multiply
    420.33x = 629.26 × 312.60
  4. Step 4: Simplify right side
    420.33x = 196,706.68
  5. Step 5: Solve for x
    x = 196,706.68/420.33
  6. Step 6: Final answer
    x = 467.98

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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.