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Finding the Fourth Proportional to 770.49, 1,155 and 331.47

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Solution

The fourth proportional to 770.49, 1,155 and 331.47 is: 496.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.49 : 1,155 = 331.47 : x
  2. Step 2: Convert to fraction form
    770.49/1,155 = 331.47/x
  3. Step 3: Cross multiply
    770.49x = 1,155 × 331.47
  4. Step 4: Simplify right side
    770.49x = 382,847.85
  5. Step 5: Solve for x
    x = 382,847.85/770.49
  6. Step 6: Final answer
    x = 496.89

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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.