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Finding the Fourth Proportional to 2,157.70, 3,236.56 and 771.38

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Solution

The fourth proportional to 2,157.70, 3,236.56 and 771.38 is: 1,157.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.70 : 3,236.56 = 771.38 : x
  2. Step 2: Convert to fraction form
    2,157.70/3,236.56 = 771.38/x
  3. Step 3: Cross multiply
    2,157.70x = 3,236.56 × 771.38
  4. Step 4: Simplify right side
    2,157.70x = 2,496,617.65
  5. Step 5: Solve for x
    x = 2,496,617.65/2,157.70
  6. Step 6: Final answer
    x = 1,157.07

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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.