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Finding the Fourth Proportional to 414.70, 621.90 and 278.46

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Solution

The fourth proportional to 414.70, 621.90 and 278.46 is: 417.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.70 : 621.90 = 278.46 : x
  2. Step 2: Convert to fraction form
    414.70/621.90 = 278.46/x
  3. Step 3: Cross multiply
    414.70x = 621.90 × 278.46
  4. Step 4: Simplify right side
    414.70x = 173,174.27
  5. Step 5: Solve for x
    x = 173,174.27/414.70
  6. Step 6: Final answer
    x = 417.59

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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.