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Finding the Fourth Proportional to 557.75, 769.70 and 309.08

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Solution

The fourth proportional to 557.75, 769.70 and 309.08 is: 426.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.75 : 769.70 = 309.08 : x
  2. Step 2: Convert to fraction form
    557.75/769.70 = 309.08/x
  3. Step 3: Cross multiply
    557.75x = 769.70 × 309.08
  4. Step 4: Simplify right side
    557.75x = 237,898.88
  5. Step 5: Solve for x
    x = 237,898.88/557.75
  6. Step 6: Final answer
    x = 426.53

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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.