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Finding the Fourth Proportional to 419.15, 627.45 and 280.49

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Solution

The fourth proportional to 419.15, 627.45 and 280.49 is: 419.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.15 : 627.45 = 280.49 : x
  2. Step 2: Convert to fraction form
    419.15/627.45 = 280.49/x
  3. Step 3: Cross multiply
    419.15x = 627.45 × 280.49
  4. Step 4: Simplify right side
    419.15x = 175,990.31
  5. Step 5: Solve for x
    x = 175,990.31/419.15
  6. Step 6: Final answer
    x = 419.88

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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.