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Finding the Fourth Proportional to 420.03, 629.94 and 169.86

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Solution

The fourth proportional to 420.03, 629.94 and 169.86 is: 254.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.03 : 629.94 = 169.86 : x
  2. Step 2: Convert to fraction form
    420.03/629.94 = 169.86/x
  3. Step 3: Cross multiply
    420.03x = 629.94 × 169.86
  4. Step 4: Simplify right side
    420.03x = 107,001.61
  5. Step 5: Solve for x
    x = 107,001.61/420.03
  6. Step 6: Final answer
    x = 254.75

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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.