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Finding the Fourth Proportional to 771.89, 1,157.96 and 251.74

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Solution

The fourth proportional to 771.89, 1,157.96 and 251.74 is: 377.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.89 : 1,157.96 = 251.74 : x
  2. Step 2: Convert to fraction form
    771.89/1,157.96 = 251.74/x
  3. Step 3: Cross multiply
    771.89x = 1,157.96 × 251.74
  4. Step 4: Simplify right side
    771.89x = 291,497.80
  5. Step 5: Solve for x
    x = 291,497.80/771.89
  6. Step 6: Final answer
    x = 377.64

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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.