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Finding the Fourth Proportional to 771.88, 1,157.82 and 385.96

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Solution

The fourth proportional to 771.88, 1,157.82 and 385.96 is: 578.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.88 : 1,157.82 = 385.96 : x
  2. Step 2: Convert to fraction form
    771.88/1,157.82 = 385.96/x
  3. Step 3: Cross multiply
    771.88x = 1,157.82 × 385.96
  4. Step 4: Simplify right side
    771.88x = 446,872.21
  5. Step 5: Solve for x
    x = 446,872.21/771.88
  6. Step 6: Final answer
    x = 578.94

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Double scale
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1.5x scale

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.