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Finding the Fourth Proportional to 578.21, 867.20 and 207.96

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Solution

The fourth proportional to 578.21, 867.20 and 207.96 is: 311.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.21 : 867.20 = 207.96 : x
  2. Step 2: Convert to fraction form
    578.21/867.20 = 207.96/x
  3. Step 3: Cross multiply
    578.21x = 867.20 × 207.96
  4. Step 4: Simplify right side
    578.21x = 180,342.91
  5. Step 5: Solve for x
    x = 180,342.91/578.21
  6. Step 6: Final answer
    x = 311.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.