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Finding the Fourth Proportional to 557.91, 769.94 and 309.21

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Solution

The fourth proportional to 557.91, 769.94 and 309.21 is: 426.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.91 : 769.94 = 309.21 : x
  2. Step 2: Convert to fraction form
    557.91/769.94 = 309.21/x
  3. Step 3: Cross multiply
    557.91x = 769.94 × 309.21
  4. Step 4: Simplify right side
    557.91x = 238,073.15
  5. Step 5: Solve for x
    x = 238,073.15/557.91
  6. Step 6: Final answer
    x = 426.72

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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.