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Finding the Fourth Proportional to 490.91, 677.10 and 455.87

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Solution

The fourth proportional to 490.91, 677.10 and 455.87 is: 628.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.91 : 677.10 = 455.87 : x
  2. Step 2: Convert to fraction form
    490.91/677.10 = 455.87/x
  3. Step 3: Cross multiply
    490.91x = 677.10 × 455.87
  4. Step 4: Simplify right side
    490.91x = 308,669.58
  5. Step 5: Solve for x
    x = 308,669.58/490.91
  6. Step 6: Final answer
    x = 628.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.