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Finding the Fourth Proportional to 514.49, 770.72 and 427.55

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Solution

The fourth proportional to 514.49, 770.72 and 427.55 is: 640.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.49 : 770.72 = 427.55 : x
  2. Step 2: Convert to fraction form
    514.49/770.72 = 427.55/x
  3. Step 3: Cross multiply
    514.49x = 770.72 × 427.55
  4. Step 4: Simplify right side
    514.49x = 329,515.34
  5. Step 5: Solve for x
    x = 329,515.34/514.49
  6. Step 6: Final answer
    x = 640.48

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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.