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Finding the Fourth Proportional to 771.17, 1,156.91 and 251.21

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Solution

The fourth proportional to 771.17, 1,156.91 and 251.21 is: 376.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.17 : 1,156.91 = 251.21 : x
  2. Step 2: Convert to fraction form
    771.17/1,156.91 = 251.21/x
  3. Step 3: Cross multiply
    771.17x = 1,156.91 × 251.21
  4. Step 4: Simplify right side
    771.17x = 290,629.00
  5. Step 5: Solve for x
    x = 290,629.00/771.17
  6. Step 6: Final answer
    x = 376.87

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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.