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Finding the Fourth Proportional to 556.80, 768.12 and 323.88

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Solution

The fourth proportional to 556.80, 768.12 and 323.88 is: 446.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.80 : 768.12 = 323.88 : x
  2. Step 2: Convert to fraction form
    556.80/768.12 = 323.88/x
  3. Step 3: Cross multiply
    556.80x = 768.12 × 323.88
  4. Step 4: Simplify right side
    556.80x = 248,778.71
  5. Step 5: Solve for x
    x = 248,778.71/556.80
  6. Step 6: Final answer
    x = 446.80

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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.