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Finding the Fourth Proportional to 514.28, 770.91 and 440.87

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Solution

The fourth proportional to 514.28, 770.91 and 440.87 is: 660.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.28 : 770.91 = 440.87 : x
  2. Step 2: Convert to fraction form
    514.28/770.91 = 440.87/x
  3. Step 3: Cross multiply
    514.28x = 770.91 × 440.87
  4. Step 4: Simplify right side
    514.28x = 339,871.09
  5. Step 5: Solve for x
    x = 339,871.09/514.28
  6. Step 6: Final answer
    x = 660.87

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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.