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Finding the Fourth Proportional to 514.28, 771.36 and 129.50

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Solution

The fourth proportional to 514.28, 771.36 and 129.50 is: 194.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.28 : 771.36 = 129.50 : x
  2. Step 2: Convert to fraction form
    514.28/771.36 = 129.50/x
  3. Step 3: Cross multiply
    514.28x = 771.36 × 129.50
  4. Step 4: Simplify right side
    514.28x = 99,891.12
  5. Step 5: Solve for x
    x = 99,891.12/514.28
  6. Step 6: Final answer
    x = 194.23

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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.