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Finding the Fourth Proportional to 556.89, 768.45 and 308.20

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Solution

The fourth proportional to 556.89, 768.45 and 308.20 is: 425.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.89 : 768.45 = 308.20 : x
  2. Step 2: Convert to fraction form
    556.89/768.45 = 308.20/x
  3. Step 3: Cross multiply
    556.89x = 768.45 × 308.20
  4. Step 4: Simplify right side
    556.89x = 236,836.29
  5. Step 5: Solve for x
    x = 236,836.29/556.89
  6. Step 6: Final answer
    x = 425.28

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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.