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Finding the Fourth Proportional to 557.52, 769.13 and 321.42

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Solution

The fourth proportional to 557.52, 769.13 and 321.42 is: 443.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.52 : 769.13 = 321.42 : x
  2. Step 2: Convert to fraction form
    557.52/769.13 = 321.42/x
  3. Step 3: Cross multiply
    557.52x = 769.13 × 321.42
  4. Step 4: Simplify right side
    557.52x = 247,213.76
  5. Step 5: Solve for x
    x = 247,213.76/557.52
  6. Step 6: Final answer
    x = 443.42

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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.