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Finding the Fourth Proportional to 770.78, 1,155.23 and 331.53

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Solution

The fourth proportional to 770.78, 1,155.23 and 331.53 is: 496.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.78 : 1,155.23 = 331.53 : x
  2. Step 2: Convert to fraction form
    770.78/1,155.23 = 331.53/x
  3. Step 3: Cross multiply
    770.78x = 1,155.23 × 331.53
  4. Step 4: Simplify right side
    770.78x = 382,988.66
  5. Step 5: Solve for x
    x = 382,988.66/770.78
  6. Step 6: Final answer
    x = 496.88

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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.