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Finding the Fourth Proportional to 771.37, 1,157.18 and 258.25

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Solution

The fourth proportional to 771.37, 1,157.18 and 258.25 is: 387.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.37 : 1,157.18 = 258.25 : x
  2. Step 2: Convert to fraction form
    771.37/1,157.18 = 258.25/x
  3. Step 3: Cross multiply
    771.37x = 1,157.18 × 258.25
  4. Step 4: Simplify right side
    771.37x = 298,840.44
  5. Step 5: Solve for x
    x = 298,840.44/771.37
  6. Step 6: Final answer
    x = 387.42

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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.