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Finding the Fourth Proportional to 313.18, 469.11 and 221.50

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Solution

The fourth proportional to 313.18, 469.11 and 221.50 is: 331.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.18 : 469.11 = 221.50 : x
  2. Step 2: Convert to fraction form
    313.18/469.11 = 221.50/x
  3. Step 3: Cross multiply
    313.18x = 469.11 × 221.50
  4. Step 4: Simplify right side
    313.18x = 103,907.87
  5. Step 5: Solve for x
    x = 103,907.87/313.18
  6. Step 6: Final answer
    x = 331.78

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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.