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Finding the Fourth Proportional to 771.90, 1,158.08 and 361.27

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Solution

The fourth proportional to 771.90, 1,158.08 and 361.27 is: 542.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.90 : 1,158.08 = 361.27 : x
  2. Step 2: Convert to fraction form
    771.90/1,158.08 = 361.27/x
  3. Step 3: Cross multiply
    771.90x = 1,158.08 × 361.27
  4. Step 4: Simplify right side
    771.90x = 418,379.56
  5. Step 5: Solve for x
    x = 418,379.56/771.90
  6. Step 6: Final answer
    x = 542.01

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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.