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Finding the Fourth Proportional to 771.96, 1,158.39 and 285.35

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Solution

The fourth proportional to 771.96, 1,158.39 and 285.35 is: 428.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.96 : 1,158.39 = 285.35 : x
  2. Step 2: Convert to fraction form
    771.96/1,158.39 = 285.35/x
  3. Step 3: Cross multiply
    771.96x = 1,158.39 × 285.35
  4. Step 4: Simplify right side
    771.96x = 330,540.79
  5. Step 5: Solve for x
    x = 330,540.79/771.96
  6. Step 6: Final answer
    x = 428.18

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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.