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Finding the Fourth Proportional to 320.20, 479.85 and 251.85

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Solution

The fourth proportional to 320.20, 479.85 and 251.85 is: 377.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.20 : 479.85 = 251.85 : x
  2. Step 2: Convert to fraction form
    320.20/479.85 = 251.85/x
  3. Step 3: Cross multiply
    320.20x = 479.85 × 251.85
  4. Step 4: Simplify right side
    320.20x = 120,851.08
  5. Step 5: Solve for x
    x = 120,851.08/320.20
  6. Step 6: Final answer
    x = 377.43

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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.