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Finding the Fourth Proportional to 419.22, 627.36 and 281.58

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Solution

The fourth proportional to 419.22, 627.36 and 281.58 is: 421.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.22 : 627.36 = 281.58 : x
  2. Step 2: Convert to fraction form
    419.22/627.36 = 281.58/x
  3. Step 3: Cross multiply
    419.22x = 627.36 × 281.58
  4. Step 4: Simplify right side
    419.22x = 176,652.03
  5. Step 5: Solve for x
    x = 176,652.03/419.22
  6. Step 6: Final answer
    x = 421.38

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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.