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Finding the Fourth Proportional to 312.86, 468.65 and 221.27

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Solution

The fourth proportional to 312.86, 468.65 and 221.27 is: 331.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.86 : 468.65 = 221.27 : x
  2. Step 2: Convert to fraction form
    312.86/468.65 = 221.27/x
  3. Step 3: Cross multiply
    312.86x = 468.65 × 221.27
  4. Step 4: Simplify right side
    312.86x = 103,696.40
  5. Step 5: Solve for x
    x = 103,696.40/312.86
  6. Step 6: Final answer
    x = 331.44

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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.