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Finding the Fourth Proportional to 771.58, 1,157.36 and 251.94

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Solution

The fourth proportional to 771.58, 1,157.36 and 251.94 is: 377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.58 : 1,157.36 = 251.94 : x
  2. Step 2: Convert to fraction form
    771.58/1,157.36 = 251.94/x
  3. Step 3: Cross multiply
    771.58x = 1,157.36 × 251.94
  4. Step 4: Simplify right side
    771.58x = 291,580.72
  5. Step 5: Solve for x
    x = 291,580.72/771.58
  6. Step 6: Final answer
    x = 377.90

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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.