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Finding the Fourth Proportional to 556.68, 768.12 and 399.60

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Solution

The fourth proportional to 556.68, 768.12 and 399.60 is: 551.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.68 : 768.12 = 399.60 : x
  2. Step 2: Convert to fraction form
    556.68/768.12 = 399.60/x
  3. Step 3: Cross multiply
    556.68x = 768.12 × 399.60
  4. Step 4: Simplify right side
    556.68x = 306,940.75
  5. Step 5: Solve for x
    x = 306,940.75/556.68
  6. Step 6: Final answer
    x = 551.38

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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.