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Finding the Fourth Proportional to 771.70, 1,157.34 and 338.75

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Solution

The fourth proportional to 771.70, 1,157.34 and 338.75 is: 508.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.70 : 1,157.34 = 338.75 : x
  2. Step 2: Convert to fraction form
    771.70/1,157.34 = 338.75/x
  3. Step 3: Cross multiply
    771.70x = 1,157.34 × 338.75
  4. Step 4: Simplify right side
    771.70x = 392,048.93
  5. Step 5: Solve for x
    x = 392,048.93/771.70
  6. Step 6: Final answer
    x = 508.03

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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.