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Finding the Fourth Proportional to 419.60, 629.40 and 411.60

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Solution

The fourth proportional to 419.60, 629.40 and 411.60 is: 617.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.60 : 629.40 = 411.60 : x
  2. Step 2: Convert to fraction form
    419.60/629.40 = 411.60/x
  3. Step 3: Cross multiply
    419.60x = 629.40 × 411.60
  4. Step 4: Simplify right side
    419.60x = 259,061.04
  5. Step 5: Solve for x
    x = 259,061.04/419.60
  6. Step 6: Final answer
    x = 617.40

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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.