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Finding the Fourth Proportional to 557.80, 769.79 and 321.83

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Solution

The fourth proportional to 557.80, 769.79 and 321.83 is: 444.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.80 : 769.79 = 321.83 : x
  2. Step 2: Convert to fraction form
    557.80/769.79 = 321.83/x
  3. Step 3: Cross multiply
    557.80x = 769.79 × 321.83
  4. Step 4: Simplify right side
    557.80x = 247,737.98
  5. Step 5: Solve for x
    x = 247,737.98/557.80
  6. Step 6: Final answer
    x = 444.13

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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.