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Finding the Fourth Proportional to 557.46, 769.28 and 305.39

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Solution

The fourth proportional to 557.46, 769.28 and 305.39 is: 421.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.46 : 769.28 = 305.39 : x
  2. Step 2: Convert to fraction form
    557.46/769.28 = 305.39/x
  3. Step 3: Cross multiply
    557.46x = 769.28 × 305.39
  4. Step 4: Simplify right side
    557.46x = 234,930.82
  5. Step 5: Solve for x
    x = 234,930.82/557.46
  6. Step 6: Final answer
    x = 421.43

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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.