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Finding the Fourth Proportional to 251.55, 377.91 and 221.76

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Solution

The fourth proportional to 251.55, 377.91 and 221.76 is: 333.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.55 : 377.91 = 221.76 : x
  2. Step 2: Convert to fraction form
    251.55/377.91 = 221.76/x
  3. Step 3: Cross multiply
    251.55x = 377.91 × 221.76
  4. Step 4: Simplify right side
    251.55x = 83,804.21
  5. Step 5: Solve for x
    x = 83,804.21/251.55
  6. Step 6: Final answer
    x = 333.15

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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.