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Finding the Fourth Proportional to 557.78, 769.75 and 309.11

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Solution

The fourth proportional to 557.78, 769.75 and 309.11 is: 426.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.78 : 769.75 = 309.11 : x
  2. Step 2: Convert to fraction form
    557.78/769.75 = 309.11/x
  3. Step 3: Cross multiply
    557.78x = 769.75 × 309.11
  4. Step 4: Simplify right side
    557.78x = 237,932.03
  5. Step 5: Solve for x
    x = 237,932.03/557.78
  6. Step 6: Final answer
    x = 426.57

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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.