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Finding the Fourth Proportional to 557.81, 769.93 and 321.79

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Solution

The fourth proportional to 557.81, 769.93 and 321.79 is: 444.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.81 : 769.93 = 321.79 : x
  2. Step 2: Convert to fraction form
    557.81/769.93 = 321.79/x
  3. Step 3: Cross multiply
    557.81x = 769.93 × 321.79
  4. Step 4: Simplify right side
    557.81x = 247,753.05
  5. Step 5: Solve for x
    x = 247,753.05/557.81
  6. Step 6: Final answer
    x = 444.15

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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.