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Finding the Fourth Proportional to 557.96, 769.99 and 309.30

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Solution

The fourth proportional to 557.96, 769.99 and 309.30 is: 426.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.96 : 769.99 = 309.30 : x
  2. Step 2: Convert to fraction form
    557.96/769.99 = 309.30/x
  3. Step 3: Cross multiply
    557.96x = 769.99 × 309.30
  4. Step 4: Simplify right side
    557.96x = 238,157.13
  5. Step 5: Solve for x
    x = 238,157.13/557.96
  6. Step 6: Final answer
    x = 426.83

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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.