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Finding the Fourth Proportional to 514.31, 771.47 and 221.90

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Solution

The fourth proportional to 514.31, 771.47 and 221.90 is: 332.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.31 : 771.47 = 221.90 : x
  2. Step 2: Convert to fraction form
    514.31/771.47 = 221.90/x
  3. Step 3: Cross multiply
    514.31x = 771.47 × 221.90
  4. Step 4: Simplify right side
    514.31x = 171,188.08
  5. Step 5: Solve for x
    x = 171,188.08/514.31
  6. Step 6: Final answer
    x = 332.85

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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.