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Finding the Fourth Proportional to 556.69, 768.22 and 308

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Solution

The fourth proportional to 556.69, 768.22 and 308 is: 425.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.69 : 768.22 = 308 : x
  2. Step 2: Convert to fraction form
    556.69/768.22 = 308/x
  3. Step 3: Cross multiply
    556.69x = 768.22 × 308
  4. Step 4: Simplify right side
    556.69x = 236,611.76
  5. Step 5: Solve for x
    x = 236,611.76/556.69
  6. Step 6: Final answer
    x = 425.03

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.