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Finding the Fourth Proportional to 559.05, 771.65 and 393.30

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Solution

The fourth proportional to 559.05, 771.65 and 393.30 is: 542.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.05 : 771.65 = 393.30 : x
  2. Step 2: Convert to fraction form
    559.05/771.65 = 393.30/x
  3. Step 3: Cross multiply
    559.05x = 771.65 × 393.30
  4. Step 4: Simplify right side
    559.05x = 303,487.98
  5. Step 5: Solve for x
    x = 303,487.98/559.05
  6. Step 6: Final answer
    x = 542.86

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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.