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Finding the Fourth Proportional to 514.20, 771 and 189.60

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Solution

The fourth proportional to 514.20, 771 and 189.60 is: 284.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.20 : 771 = 189.60 : x
  2. Step 2: Convert to fraction form
    514.20/771 = 189.60/x
  3. Step 3: Cross multiply
    514.20x = 771 × 189.60
  4. Step 4: Simplify right side
    514.20x = 146,181.60
  5. Step 5: Solve for x
    x = 146,181.60/514.20
  6. Step 6: Final answer
    x = 284.29

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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.