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Finding the Fourth Proportional to 414.14, 621.81 and 378.90

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Solution

The fourth proportional to 414.14, 621.81 and 378.90 is: 568.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.14 : 621.81 = 378.90 : x
  2. Step 2: Convert to fraction form
    414.14/621.81 = 378.90/x
  3. Step 3: Cross multiply
    414.14x = 621.81 × 378.90
  4. Step 4: Simplify right side
    414.14x = 235,603.81
  5. Step 5: Solve for x
    x = 235,603.81/414.14
  6. Step 6: Final answer
    x = 568.91

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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.