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Finding the Fourth Proportional to 419.52, 629.40 and 398.88

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Solution

The fourth proportional to 419.52, 629.40 and 398.88 is: 598.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.52 : 629.40 = 398.88 : x
  2. Step 2: Convert to fraction form
    419.52/629.40 = 398.88/x
  3. Step 3: Cross multiply
    419.52x = 629.40 × 398.88
  4. Step 4: Simplify right side
    419.52x = 251,055.07
  5. Step 5: Solve for x
    x = 251,055.07/419.52
  6. Step 6: Final answer
    x = 598.43

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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.