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Finding the Fourth Proportional to 771.61, 1,157.42 and 258.61

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Solution

The fourth proportional to 771.61, 1,157.42 and 258.61 is: 387.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.61 : 1,157.42 = 258.61 : x
  2. Step 2: Convert to fraction form
    771.61/1,157.42 = 258.61/x
  3. Step 3: Cross multiply
    771.61x = 1,157.42 × 258.61
  4. Step 4: Simplify right side
    771.61x = 299,318.85
  5. Step 5: Solve for x
    x = 299,318.85/771.61
  6. Step 6: Final answer
    x = 387.92

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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.