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Finding the Fourth Proportional to 513.51, 770.31 and 221.02

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Solution

The fourth proportional to 513.51, 770.31 and 221.02 is: 331.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.51 : 770.31 = 221.02 : x
  2. Step 2: Convert to fraction form
    513.51/770.31 = 221.02/x
  3. Step 3: Cross multiply
    513.51x = 770.31 × 221.02
  4. Step 4: Simplify right side
    513.51x = 170,249.86
  5. Step 5: Solve for x
    x = 170,249.86/513.51
  6. Step 6: Final answer
    x = 331.54

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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.