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Finding the Fourth Proportional to 629.30, 868.74 and 419.60

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Solution

The fourth proportional to 629.30, 868.74 and 419.60 is: 579.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.30 : 868.74 = 419.60 : x
  2. Step 2: Convert to fraction form
    629.30/868.74 = 419.60/x
  3. Step 3: Cross multiply
    629.30x = 868.74 × 419.60
  4. Step 4: Simplify right side
    629.30x = 364,523.30
  5. Step 5: Solve for x
    x = 364,523.30/629.30
  6. Step 6: Final answer
    x = 579.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.