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Finding the Fourth Proportional to 312.85, 468.76 and 221.39

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Solution

The fourth proportional to 312.85, 468.76 and 221.39 is: 331.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.85 : 468.76 = 221.39 : x
  2. Step 2: Convert to fraction form
    312.85/468.76 = 221.39/x
  3. Step 3: Cross multiply
    312.85x = 468.76 × 221.39
  4. Step 4: Simplify right side
    312.85x = 103,778.78
  5. Step 5: Solve for x
    x = 103,778.78/312.85
  6. Step 6: Final answer
    x = 331.72

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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.