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Finding the Fourth Proportional to 513.02, 769.20 and 281.49

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Solution

The fourth proportional to 513.02, 769.20 and 281.49 is: 422.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.02 : 769.20 = 281.49 : x
  2. Step 2: Convert to fraction form
    513.02/769.20 = 281.49/x
  3. Step 3: Cross multiply
    513.02x = 769.20 × 281.49
  4. Step 4: Simplify right side
    513.02x = 216,522.11
  5. Step 5: Solve for x
    x = 216,522.11/513.02
  6. Step 6: Final answer
    x = 422.05

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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.