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Finding the Fourth Proportional to 490.13, 676.78 and 315.77

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Solution

The fourth proportional to 490.13, 676.78 and 315.77 is: 436.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.13 : 676.78 = 315.77 : x
  2. Step 2: Convert to fraction form
    490.13/676.78 = 315.77/x
  3. Step 3: Cross multiply
    490.13x = 676.78 × 315.77
  4. Step 4: Simplify right side
    490.13x = 213,707.72
  5. Step 5: Solve for x
    x = 213,707.72/490.13
  6. Step 6: Final answer
    x = 436.03

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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.