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Finding the Fourth Proportional to 771.78, 1,157.67 and 361.21

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Solution

The fourth proportional to 771.78, 1,157.67 and 361.21 is: 541.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.78 : 1,157.67 = 361.21 : x
  2. Step 2: Convert to fraction form
    771.78/1,157.67 = 361.21/x
  3. Step 3: Cross multiply
    771.78x = 1,157.67 × 361.21
  4. Step 4: Simplify right side
    771.78x = 418,156.19
  5. Step 5: Solve for x
    x = 418,156.19/771.78
  6. Step 6: Final answer
    x = 541.81

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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.