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Finding the Fourth Proportional to 490.52, 677.20 and 379.76

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Solution

The fourth proportional to 490.52, 677.20 and 379.76 is: 524.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.52 : 677.20 = 379.76 : x
  2. Step 2: Convert to fraction form
    490.52/677.20 = 379.76/x
  3. Step 3: Cross multiply
    490.52x = 677.20 × 379.76
  4. Step 4: Simplify right side
    490.52x = 257,173.47
  5. Step 5: Solve for x
    x = 257,173.47/490.52
  6. Step 6: Final answer
    x = 524.29

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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.