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Finding the Fourth Proportional to 557.24, 769 and 308.56

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Solution

The fourth proportional to 557.24, 769 and 308.56 is: 425.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.24 : 769 = 308.56 : x
  2. Step 2: Convert to fraction form
    557.24/769 = 308.56/x
  3. Step 3: Cross multiply
    557.24x = 769 × 308.56
  4. Step 4: Simplify right side
    557.24x = 237,282.64
  5. Step 5: Solve for x
    x = 237,282.64/557.24
  6. Step 6: Final answer
    x = 425.82

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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.