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Finding the Fourth Proportional to 557.69, 769.55 and 321.65

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Solution

The fourth proportional to 557.69, 769.55 and 321.65 is: 443.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.69 : 769.55 = 321.65 : x
  2. Step 2: Convert to fraction form
    557.69/769.55 = 321.65/x
  3. Step 3: Cross multiply
    557.69x = 769.55 × 321.65
  4. Step 4: Simplify right side
    557.69x = 247,529.33
  5. Step 5: Solve for x
    x = 247,529.33/557.69
  6. Step 6: Final answer
    x = 443.85

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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.