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Finding the Fourth Proportional to 419.57, 629.57 and 317.48

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Solution

The fourth proportional to 419.57, 629.57 and 317.48 is: 476.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.57 : 629.57 = 317.48 : x
  2. Step 2: Convert to fraction form
    419.57/629.57 = 317.48/x
  3. Step 3: Cross multiply
    419.57x = 629.57 × 317.48
  4. Step 4: Simplify right side
    419.57x = 199,874.70
  5. Step 5: Solve for x
    x = 199,874.70/419.57
  6. Step 6: Final answer
    x = 476.38

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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.