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Finding the Fourth Proportional to 557.45, 769.28 and 308.79

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Solution

The fourth proportional to 557.45, 769.28 and 308.79 is: 426.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.45 : 769.28 = 308.79 : x
  2. Step 2: Convert to fraction form
    557.45/769.28 = 308.79/x
  3. Step 3: Cross multiply
    557.45x = 769.28 × 308.79
  4. Step 4: Simplify right side
    557.45x = 237,545.97
  5. Step 5: Solve for x
    x = 237,545.97/557.45
  6. Step 6: Final answer
    x = 426.13

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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.