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Finding the Fourth Proportional to 420.03, 629.86 and 173.19

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Solution

The fourth proportional to 420.03, 629.86 and 173.19 is: 259.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.03 : 629.86 = 173.19 : x
  2. Step 2: Convert to fraction form
    420.03/629.86 = 173.19/x
  3. Step 3: Cross multiply
    420.03x = 629.86 × 173.19
  4. Step 4: Simplify right side
    420.03x = 109,085.45
  5. Step 5: Solve for x
    x = 109,085.45/420.03
  6. Step 6: Final answer
    x = 259.71

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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.