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Finding the Fourth Proportional to 419.60, 629.84 and 403.21

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Solution

The fourth proportional to 419.60, 629.84 and 403.21 is: 605.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.60 : 629.84 = 403.21 : x
  2. Step 2: Convert to fraction form
    419.60/629.84 = 403.21/x
  3. Step 3: Cross multiply
    419.60x = 629.84 × 403.21
  4. Step 4: Simplify right side
    419.60x = 253,957.79
  5. Step 5: Solve for x
    x = 253,957.79/419.60
  6. Step 6: Final answer
    x = 605.24

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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.