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Finding the Fourth Proportional to 419.83, 629.74 and 317.31

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Solution

The fourth proportional to 419.83, 629.74 and 317.31 is: 475.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.83 : 629.74 = 317.31 : x
  2. Step 2: Convert to fraction form
    419.83/629.74 = 317.31/x
  3. Step 3: Cross multiply
    419.83x = 629.74 × 317.31
  4. Step 4: Simplify right side
    419.83x = 199,821.21
  5. Step 5: Solve for x
    x = 199,821.21/419.83
  6. Step 6: Final answer
    x = 475.96

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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.