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Finding the Fourth Proportional to 513.60, 770.28 and 421.92

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Solution

The fourth proportional to 513.60, 770.28 and 421.92 is: 632.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.60 : 770.28 = 421.92 : x
  2. Step 2: Convert to fraction form
    513.60/770.28 = 421.92/x
  3. Step 3: Cross multiply
    513.60x = 770.28 × 421.92
  4. Step 4: Simplify right side
    513.60x = 324,996.54
  5. Step 5: Solve for x
    x = 324,996.54/513.60
  6. Step 6: Final answer
    x = 632.78

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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.